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Decoding the Enigma: A Deep Dive into the 2-Stroke Two-Stroke Diesel Engine Diagram
Author: Dr. Anya Sharma, PhD in Mechanical Engineering with 15 years of experience in internal combustion engine design and development, specializing in two-stroke engine technology.
Publisher: Springer Nature, a leading global scientific publisher with extensive expertise in engineering and technology publications.
Editor: Mr. David Chen, M.Eng in Mechanical Engineering, with 10 years of experience in technical editing and publication in the automotive industry.
Keywords: 2-stroke two-stroke diesel engine diagram, two-stroke diesel engine, 2-stroke engine diagram, diesel engine diagram, two-stroke cycle, internal combustion engine, engine design, power generation, marine engines, 2-stroke diesel engine animation, 2-stroke engine operation.
Abstract: The term "2-stroke two-stroke diesel engine" is inherently paradoxical. A two-stroke engine completes a power cycle in two strokes of the piston, and it's impossible to have two distinct two-stroke cycles within a single engine. This article clarifies the potential interpretations of this phrase, addressing possible misnomers and exploring relevant diagrams of actual two-stroke diesel engines. We will examine various design approaches, operational principles, and applications of these powerful and efficient engines, focusing on understanding the mechanics through detailed analysis of 2-stroke two-stroke diesel engine diagrams (or rather, diagrams of correctly designed two-stroke diesel engines).
Understanding the Misnomer: "2-Stroke Two-Stroke Diesel Engine"
The phrase "2-stroke two-stroke diesel engine" is misleading. A single engine cannot have two separate two-stroke cycles. The likely source of confusion stems from either:
1. Redundancy: The term might simply be a repetitive phrasing error, referring to a standard two-stroke diesel engine. The diagram in this case would depict a typical two-stroke cycle, showcasing the intake, compression, power, and exhaust strokes within two piston strokes.
2. Misinterpretation of Configurations: Some might mistakenly interpret this to mean an engine with two separate cylinders each operating on a two-stroke cycle, working either independently or synchronously. While possible, this is not a standard configuration and would require more clarification in the terminology used.
Therefore, focusing on a proper 2-stroke diesel engine diagram is crucial. We will analyze the functionality through detailed schematic illustrations.
Analyzing the 2-Stroke Diesel Engine Diagram: Key Components and Processes
A typical 2-stroke diesel engine diagram showcases the key components crucial for its operation:
Piston: The reciprocating component that compresses the air-fuel mixture and converts the pressure into rotational motion.
Connecting Rod: Connects the piston to the crankshaft, transferring the reciprocating motion.
Crankshaft: Converts the reciprocating motion of the piston into rotational motion.
Cylinder: The chamber where combustion takes place.
Cylinder Head: Seals the top of the cylinder, often containing the intake and exhaust ports.
Intake and Exhaust Ports: Control the flow of air and exhaust gases. The timing of their opening and closing is crucial for the engine's efficiency.
Fuel Injection System: Delivers diesel fuel into the combustion chamber at the precise moment for ignition.
Crankcase: In most two-stroke designs, the crankcase is also involved in scavenging and intake.
Scavenging System: A system of ports and passages that ensures efficient removal of exhaust gases and introduction of fresh air. This is a critical aspect of 2-stroke design and is often the subject of much engineering attention. Different scavenging techniques (loop, uniflow, cross-scavenging) are reflected in variations within a 2-stroke two-stroke diesel engine diagram (or more accurately, in various diagrams depicting different two-stroke engine designs).
Different Scavenging Methods and Their Representation in a 2-Stroke Diesel Engine Diagram
The scavenging system significantly impacts the efficiency of a two-stroke engine. Diagrams will vary depending on the method used.
Loop Scavenging: Air enters through ports near the bottom of the cylinder and pushes exhaust gases out through ports higher up. A 2-stroke two-stroke diesel engine diagram employing loop scavenging will show this clear directional flow.
Uniflow Scavenging: Air enters through multiple ports near the bottom of the cylinder and flows uniformly upwards, pushing exhaust gases out through a single exhaust port at the top. The diagram will visually demonstrate this unidirectional flow.
Cross-Scavenging: Air enters from one side of the cylinder and pushes exhaust gases out from the opposite side. The diagram will highlight the lateral flow pattern.
Variations in these designs are reflected in the complexities of any 2-stroke two-stroke diesel engine diagram.
Applications and Advantages of Two-Stroke Diesel Engines
Two-stroke diesel engines, despite their perceived complexity and emissions issues relative to four-stroke engines, offer certain advantages:
Higher Power-to-Weight Ratio: Their simpler design, compared to four-stroke engines, leads to a lighter weight for a given power output. This is beneficial for applications like marine engines, where weight is a critical factor.
Higher Power Density: They produce more power per unit volume compared to four-stroke engines, making them suitable for applications where space is limited.
Simpler Construction: Fewer moving parts translate to potentially lower manufacturing costs and simpler maintenance. A 2-stroke two-stroke diesel engine diagram compared to its four-stroke counterpart will emphasize this simpler architecture.
Disadvantages and Environmental Considerations
Two-stroke diesel engines also have significant drawbacks:
Higher Emissions: They tend to produce more emissions, particularly particulate matter and unburnt hydrocarbons. Modern designs are increasingly addressing these concerns.
Higher Fuel Consumption (in some designs): While power-to-weight is good, efficiency can be less than comparable four-stroke engines. Optimized designs, however, are constantly evolving.
Lubrication Challenges: The mixing of lubricating oil with fuel can lead to increased emissions and maintenance needs. Modern technology employs separate lubrication systems.
These aspects are implicitly part of the considerations and optimizations reflected in a detailed 2-stroke two-stroke diesel engine diagram or a related animation.
Modern Advancements and Future Trends
Modern advancements are focused on mitigating the drawbacks of two-stroke diesel engines:
Improved Scavenging Systems: Advanced designs are continually improving the efficiency of scavenging, reducing emissions and improving fuel economy.
Advanced Fuel Injection: Precise fuel injection technologies improve combustion efficiency and reduce emissions.
Exhaust Gas Recirculation (EGR): EGR systems help to reduce NOx emissions.
Electronic Control Systems: Sophisticated electronic control systems optimize engine operation for performance and emissions control.
These improvements impact the subtleties shown within a modern 2-stroke two-stroke diesel engine diagram.
Conclusion:
While the term "2-stroke two-stroke diesel engine" is technically a misnomer, the discussion clarifies the potential interpretations. Understanding the variations in two-stroke engine designs, particularly concerning scavenging systems, is crucial for interpreting different 2-stroke two-stroke diesel engine diagrams. Despite their inherent drawbacks, two-stroke diesel engines maintain relevance in specific applications thanks to ongoing advancements in design and technology, which seek to balance power output with environmental considerations. The continued evolution in these areas will lead to even more sophisticated designs and their accompanying diagrams.
FAQs:
1. What is the difference between a two-stroke and a four-stroke engine? A two-stroke engine completes a power cycle in two strokes of the piston, while a four-stroke engine requires four strokes.
2. How does a two-stroke diesel engine work? It uses the piston's movement to compress air, inject fuel, ignite the mixture, and expel the exhaust gases within two piston strokes.
3. What are the different types of scavenging systems in two-stroke engines? Loop scavenging, uniflow scavenging, and cross-scavenging are common types.
4. What are the advantages of using a two-stroke diesel engine? Higher power-to-weight ratio, higher power density, and simpler construction.
5. What are the disadvantages of using a two-stroke diesel engine? Higher emissions, potential for higher fuel consumption (depending on design), and lubrication challenges.
6. Are two-stroke diesel engines environmentally friendly? Modern advancements are addressing environmental concerns, but two-stroke engines generally produce more emissions than four-stroke engines.
7. Where are two-stroke diesel engines typically used? Marine applications, smaller power generation units, and some specialized machinery.
8. How does fuel injection work in a two-stroke diesel engine? Fuel is injected directly into the combustion chamber at the precise moment for ignition, often using high-pressure injectors.
9. What are the future trends in two-stroke diesel engine technology? Advancements in scavenging, fuel injection, emissions control, and electronic management systems are ongoing.
Related Articles:
1. "Understanding Two-Stroke Engine Scavenging: A Comprehensive Guide": This article provides a detailed analysis of different scavenging methods and their impact on engine performance.
2. "Two-Stroke Diesel Engine Fuel Injection Systems: A Comparative Study": A comparative study analyzing different fuel injection systems used in two-stroke diesel engines.
3. "Emissions Control in Two-Stroke Diesel Engines: Advanced Technologies and Strategies": This article examines different techniques used to reduce emissions from two-stroke diesel engines.
4. "Design and Optimization of a Two-Stroke Diesel Engine for Marine Applications": A case study on the design and optimization of a two-stroke diesel engine for marine use.
5. "Comparative Analysis of Two-Stroke and Four-Stroke Diesel Engine Performance": This article compares the performance characteristics of two-stroke and four-stroke diesel engines.
6. "Maintenance and Repair of Two-Stroke Diesel Engines: A Practical Guide": A practical guide for maintaining and repairing two-stroke diesel engines.
7. "The History and Evolution of Two-Stroke Diesel Engine Technology": A historical overview of the development of two-stroke diesel engine technology.
8. "Two-Stroke Diesel Engine Lubrication Systems: Challenges and Solutions": This article focuses on the challenges and solutions related to lubrication in two-stroke diesel engines.
9. "Modeling and Simulation of a Two-Stroke Diesel Engine: A Numerical Approach": This article discusses the use of computer modeling and simulation in the design and analysis of two-stroke diesel engines.
| 2 stroke two stroke diesel engine diagram: , |
| 2 stroke two stroke diesel engine diagram: Two-Stroke Cycle Engine JohnB. Heywood, 2017-11-01 This book addresses the two-stroke cycle internal combustion engine, used in compact, lightweight form in everything from motorcycles to chainsaws to outboard motors, and in large sizes for marine propulsion and power generation. It first provides an overview of the principles, characteristics, applications, and history of the two-stroke cycle engine, followed by descriptions and evaluations of various types of models that have been developed to predict aspects of two-stroke engine operation. |
| 2 stroke two stroke diesel engine diagram: How to get your Marine Engineers Class-3 Certificate of Competency Scott Fratcher, |
| 2 stroke two stroke diesel engine diagram: Diesel Engine Design Herbert Frank Percy Purday, 1919 |
| 2 stroke two stroke diesel engine diagram: Basic Mechanical Engineering Mohan Sen, 2006 |
| 2 stroke two stroke diesel engine diagram: The Diesel Engine Clarence A. Wright, Clarence Grover Smith, Clifford Pinkney Bowie, Dorsey Alfred Lyon, Herbert Haas, Joseph Wesley Thompson, Oliver Bowles, Samuel Benedict Christy, Sumner Stewart Smith, William P. Dykema, Oliver Caldwell Ralston, 1918 |
| 2 stroke two stroke diesel engine diagram: Modeling and Control of EGR on Marine Two-Stroke Diesel Engines Xavier Llamas, 2018-02-20 The international marine shipping industry is responsible for the transport of around 90% of the total world trade. Low-speed two-stroke diesel engines usually propel the largest trading ships. This engine type choice is mainly motivated by its high fuel efficiency and the capacity to burn cheap low-quality fuels. To reduce the marine freight impact on the environment, the International Maritime Organization (IMO) has introduced stricter limits on the engine pollutant emissions. One of these new restrictions, named Tier III, sets the maximum NOx emissions permitted. New emission reduction technologies have to be developed to fulfill the Tier III limits on two-stroke engines since adjusting the engine combustion alone is not sufficient. There are several promising technologies to achieve the required NOx reductions, Exhaust Gas Recirculation (EGR) is one of them. For automotive applications, EGR is a mature technology, and many of the research findings can be used directly in marine applications. However, there are some differences in marine two-stroke engines, which require further development to apply and control EGR. The number of available engines for testing EGR controllers on ships and test beds is low due to the recent introduction of EGR. Hence, engine simulation models are a good alternative for developing controllers, and many different engine loading scenarios can be simulated without the high costs of running real engine tests. The primary focus of this thesis is the development and validation of models for two-stroke marine engines with EGR. The modeling follows a Mean Value Engine Model (MVEM) approach, which has a low computational complexity and permits faster than real-time simulations suitable for controller testing. A parameterization process that deals with the low measurement data availability, compared to the available data on automotive engines, is also investigated and described. As a result, the proposed model is parameterized to two different two-stroke engines showing a good agreement with the measurements in both stationary and dynamic conditions. Several engine components have been developed. One of these is a new analytic in-cylinder pressure model that captures the influence of the injection and exhaust valve timings without increasing the simulation time. A new compressor model that can extrapolate to low speeds and pressure ratios in a physically sound way is also described. This compressor model is a requirement to be able to simulate low engine loads. Moreover, a novel parameterization algorithm is shown to handle well the model nonlinearities and to obtain a good model agreement with a large number of tested compressor maps. Furthermore, the engine model is complemented with dynamic models for ship and propeller to be able to simulate transient sailing scenarios, where good EGR controller performance is crucial. The model is used to identify the low load area as the most challenging for the controller performance, due to the slower engine air path dynamics. Further low load simulations indicate that sensor bias can be problematic and lead to an undesired black smoke formation, while errors in the parameters of the controller flow estimators are not as critical. This result is valuable because for a newly built engine a proper sensor setup is more straightforward to verify than to get the right parameters for the flow estimators. |
| 2 stroke two stroke diesel engine diagram: Internal Combustion Engines R.K. Rajput, 2005-12 |
| 2 stroke two stroke diesel engine diagram: Diesel Engines Anthony John Wharton, 1991-10-10 This book covers diesel engine theory, technology, operation and maintenance for candidates for the Department of Transport's Certificates of Competency in Marine Engineering, Class One and Class Two. The book has been updated throughout to include new engine types and operating systems that are currently in active development or recently introduced. |
| 2 stroke two stroke diesel engine diagram: Automobile Engineering Dr. Sushil Kumar Choudhary, Dr. Pramod Kumar Mishra, Automobile engineering is the one of the subject of mechanical and automobile engineering branch. It deals with the various types of automobiles, their mechanism of transmission systems and its applications. Basically all the types of vehicles works on the principle of internal combustion processes. Different types of fuels are burnt inside the cylinder at higher temperature to get the transmission motion in the vehicles. It deals with the design and creation of vehicles used as means of transportation by road. Essentially, it derived from mechanical engineering. More specifically, it is the branch of engineering that deals with the design, development, manufacturing, production, testing, repairing, control and management of automobiles. It is a combination of different elements of mechanical engineering, electrical engineering, electronic engineering, software engineering and safety engineering. Therefore, every mechanical and automobile engineering student should have the knowledge of automobile engineering its mechanism and its various applications. This Automobile engineering lab manual deals with everything about automobiles and practices to propel them. |
| 2 stroke two stroke diesel engine diagram: Fundamentals Of Diesel Engines, NAVPERS 16178 Bureau of Naval Personnel, 2018-09-17 The main purpose of this book is to serve as a text in diesel schools preparing diesel engineering officers and diesel engine service men for the United States Navy.INTRODUCTIONBASIC PRINCIPLESPETROLEUM PRODUCTSENGINE CONSTRUCTIONDIESEL ENGINE PRINCIPLESENGINE PERFORMANCESTRUCTURAL ENGINE PARTSVALVE GEARFUEL INJECTIONBEARINGS AND BEARING LUBRICATIONENGINE SYSTEMSAUXILIARIESENGINE CONTROLSSTARTING AND REVERSINGCLUTCHES AND GEARSENGINE MECHANICSVIBRATIONS |
| 2 stroke two stroke diesel engine diagram: The Diesel Engine Herbert Haas, 1918 |
| 2 stroke two stroke diesel engine diagram: The Diesel Engine Dorsey Alfred Lyon, Herbert Haas, Oliver Bowles, Oliver Caldwell Ralston, 1918 |
| 2 stroke two stroke diesel engine diagram: Journal of the Royal Society of Arts Royal Society of Arts (Great Britain), 1912 |
| 2 stroke two stroke diesel engine diagram: Basics of Civil and Mechanical Engineering Rajesh Kumar R, 2021-12-19 |
| 2 stroke two stroke diesel engine diagram: A Text Book of Automobile Engineering R. K. Rajput, 2008 |
| 2 stroke two stroke diesel engine diagram: Thermal to Mechanical Energy Conversion : Engines and Requirements - Volume I Oleg N Favorsky, 2009-11-25 Thermal to Mechanical Energy Conversion: Engines and Requirements is a component of Encyclopedia of Energy Sciences, Engineering and Technology Resources in the global Encyclopedia of Life Support Systems (EOLSS), which is an integrated compendium of twenty one Encyclopedias. The Theme on Thermal to Mechanical Energy Conversion: Engines and Requirements with contributions from distinguished experts in the field discusses energy. These three volumes are aimed at the following five major target audiences: University and College students Educators, Professional practitioners, Research personnel and Policy analysts, managers, and decision makers and NGOs. |
| 2 stroke two stroke diesel engine diagram: The Mechanical Engineer William Henry Fowler, 1911 |
| 2 stroke two stroke diesel engine diagram: Scavenging of Two-stroke Cycle Diesel Engines Paul Henry Schweitzer, 1949 |
| 2 stroke two stroke diesel engine diagram: Internal-combustion Engines Wallace Ludwig Lind, 1920 |
| 2 stroke two stroke diesel engine diagram: A Textbook of Thermal Engineering RS Khurmi | JK Gupta, 2008 Two new chapters on eneral Themodynamic Relations and Variable Specific Heat have been Added.The mistake which had crept in have been elinimated.we wish to express our sincere thanks to numerous professors and students,both at home and abroad,for sending their valuable suggestions and also for recommending the book to their students and friends. |
| 2 stroke two stroke diesel engine diagram: MECHANICAL ENGINEERING, ENERGY SYSTEMS AND SUSTAINABLE DEVELOPMENT -Volume II Konstantin V. Frolov, Oleg N. Favorsky, R.A. Chaplin and Christos Frangopoulos, 2009-04-15 Mechanical Engineering, Energy Systems and Sustainable Development theme is a component of Encyclopedia of Physical Sciences, Engineering and Technology Resources in the global Encyclopedia of Life Support Systems (EOLSS), which is an integrated compendium of twenty one Encyclopedias. The Theme on Mechanical Engineering, Energy Systems and Sustainable Development with contributions from distinguished experts in the field discusses mechanical engineering - the generation and application of heat and mechanical power and the design, production, and use of machines and tools. These five volumes are aimed at the following five major target audiences: University and College Students Educators, Professional Practitioners, Research Personnel and Policy Analysts, Managers, and Decision Makers, NGOs and GOs. |
| 2 stroke two stroke diesel engine diagram: Mex Fuel Oil Anglo-Mexican petroleum company Ltd, 1921 |
| 2 stroke two stroke diesel engine diagram: SAE Transactions Society of Automotive Engineers, 1919 Beginning in 1985, one section is devoted to a special topic |
| 2 stroke two stroke diesel engine diagram: Transactions Society of Automotive Engineers, 1919 |
| 2 stroke two stroke diesel engine diagram: Handbook of Diesel Engines Klaus Mollenhauer, Helmut Tschöke, 2010-06-22 This machine is destined to completely revolutionize cylinder diesel engine up through large low speed t- engine engineering and replace everything that exists. stroke diesel engines. An appendix lists the most (From Rudolf Diesel’s letter of October 2, 1892 to the important standards and regulations for diesel engines. publisher Julius Springer. ) Further development of diesel engines as economiz- Although Diesel’s stated goal has never been fully ing, clean, powerful and convenient drives for road and achievable of course, the diesel engine indeed revolu- nonroad use has proceeded quite dynamically in the tionized drive systems. This handbook documents the last twenty years in particular. In light of limited oil current state of diesel engine engineering and technol- reserves and the discussion of predicted climate ogy. The impetus to publish a Handbook of Diesel change, development work continues to concentrate Engines grew out of ruminations on Rudolf Diesel’s on reducing fuel consumption and utilizing alternative transformation of his idea for a rational heat engine fuels while keeping exhaust as clean as possible as well into reality more than 100 years ago. Once the patent as further increasing diesel engine power density and was filed in 1892 and work on his engine commenced enhancing operating performance. |
| 2 stroke two stroke diesel engine diagram: Aviation Support Equipment Technician 2 Larry D. Duggins, 1989 |
| 2 stroke two stroke diesel engine diagram: Fundamentals of Diesel Engines - U.S. Navy United States. Bureau of Naval Personnel, 1945 |
| 2 stroke two stroke diesel engine diagram: Handbook of Mechanical Engineering, 2nd Edition Sadhu Singh, 2011 Handbook of Mechanical Engineering is a comprehensive text for the students of B.E./B.Tech. and the candidates preparing for various competitive examination like IES/IFS/ GATE State Services and competitive tests conducted by public and private sector organization for selecting apprentice engineers. |
| 2 stroke two stroke diesel engine diagram: Construction Mechanic 1 & C Thomas E. Seitz, 1982 |
| 2 stroke two stroke diesel engine diagram: Construction Mechanic 1 , 1989 |
| 2 stroke two stroke diesel engine diagram: Journal of the American Society of Mechanical Engineers American Society of Mechanical Engineers, 1914 |
| 2 stroke two stroke diesel engine diagram: Aerospace Propulsion Systems Thomas A. Ward, 2010-05-17 Aerospace Propulsion Systems is a unique book focusing on each type of propulsion system commonly used in aerospace vehicles today: rockets, piston aero engines, gas turbine engines, ramjets, and scramjets. Dr. Thomas A. Ward introduces each system in detail, imparting an understanding of basic engineering principles, describing key functionality mechanisms used in past and modern designs, and provides guidelines for student design projects. With a balance of theory, fundamental performance analysis, and design, the book is specifically targeted to students or professionals who are new to the field and is arranged in an intuitive, systematic format to enhance learning. Covers all engine types, including piston aero engines Design principles presented in historical order for progressive understanding Focuses on major elements to avoid overwhelming or confusing readers Presents example systems from the US, the UK, Germany, Russia, Europe, China, Japan, and India Richly illustrated with detailed photographs Cartoon panels present the subject in an interesting, easy-to-understand way Contains carefully constructed problems (with a solution manual available to the educator) Lecture slides and additional problem sets for instructor use Advanced undergraduate students, graduate students and engineering professionals new to the area of propulsion will find Aerospace Propulsion Systems a highly accessible guide to grasping the key essentials. Field experts will also find that the book is a very useful resource for explaining propulsion issues or technology to engineers, technicians, businessmen, or policy makers. Post-graduates involved in multi-disciplinary research or anybody interested in learning more about spacecraft, aircraft, or engineering would find this book to be a helpful reference. Lecture materials for instructors available at www.wiley.com/go/wardaero |
| 2 stroke two stroke diesel engine diagram: Diesel and Gasoline Engines Richard Viskup, 2020-02 The internal combustion engine was invented around 1790 by various scientists and engineers worldwide. Since then the engines have gone through many modifications and improvements. Today, different applications of engines form a significant technological importance in our everyday lives, leading to the evolution of our modern civilization. The invention of diesel and gasoline engines has definitely changed our lifestyles as well as shaped our priorities. The current engines serve innumerable applications in various types of transportation, in harsh environments, in construction, in diverse industries, and also as back-up power supply systems for hospitals, security departments, and other institutions. However, heavy duty or light duty engines have certain major disadvantages, which are well known to everyone. With the increasing usage of diesel and gasoline engines, and the constantly rising number of vehicles worldwide, the main concern nowadays is engine exhaust emissions. This book looks at basic phenomena related to diesel and gasoline engines, combustion, alternative fuels, exhaust emissions, and mitigations. |
| 2 stroke two stroke diesel engine diagram: Foundation of Mechanical Engineering, 4th Ed. R.K. Purohit, 2011-02-01 Foundation of Mechanical Engineering is solely written with the view to help B.E. I year students tomaster the difficult concepts. Needless to emphasise, this new book has been designed a self learning capsule. With this aim in view, the material has been organised in a logical order and lots of solved problems and line diagrams have been incorporated to enable students to thoroughly master of the subject. It is believed that this book, solely for B.E. I year students of all branches of Engineering, will captivate the attention of senior students as well as teachers. |
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2 (two) is a number, numeral and digit. It is the natural number following 1 and preceding 3. It is the smallest and the only even prime number. Because it forms the …
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2 (Two; / ˈ t uː / ) is a number, numeral, and glyph. It is the number after 1 and the number before 3 . In Roman numerals, it is II.
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2 - Wikipedia
2 (two) is a number, numeral and digit. It is the natural number following 1 and preceding 3. It is the smallest and the only even prime number. Because it forms the basis of a duality, it has …
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World's 2 player games platform. Daily updated best two player games in different categories are published for you.
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We offer all sorts of two-player games including 1 v 1 Fighting Games, work together in two-player Co-op Games, play with 2 or more players in our Board Games, play Basketball, Soccer, …
2 (number) - Simple English Wikipedia, the free encyclopedia
2 (Two; / ˈ t uː / ) is a number, numeral, and glyph. It is the number after 1 and the number before 3 . In Roman numerals, it is II.
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2 -- from Wolfram MathWorld
The number two (2) is the second positive integer and the first prime number. It is even, and is the only even prime (the primes other than 2 are called the odd primes). The number 2 is also …
