The First Law of Thermodynamics Essay

The First Law of Thermodynamics Essay

Length: 650 words (1.9 double-spaced pages)

Rating: Better Essays

Open Document

Essay Preview

1st Law of Thermodynamics - The first Law is related to conservation of energy in simple words it explains that energy can neither be created nor be destroyed it can be converted from one form to other. Law of thermodynamics defines relations between physical quantities i.e. temperature, energy, and entropy. The relation of these physical quantities can be given in different ways relating with Work, Internal Energy of a system [1].
Applications of 1st law of thermodynamics:
Heat Engine – Heat engines are designed on the basic of 1st Law, it is an idealization of a set of processes used by spark ignition internal combustion engines. The engines ingest a mixture of fuel and air, which is then compressed by a piston cylinder arrangement, which causes fuel it to react, thus effectively adding heat through converting chemical energy into thermal energy, that leads to expansion of the combustion products, and then eject the combustion products and replace them with a new charge of fuel and air. Therefore chemical reaction is converted into rotational motion along with heat is released into the environment [3].
Refrigerators - The second main application of 1st Law in which the objective of a refrigerator is to lower the internal energy of a body at low temperature and transfer that energy to the higher temperature surroundings [3]. It requires work to do this. The medium for the energy exchange is a working fluid that circulates in a loop through a number of devices. These devices exploit to increase and eliminate energy from the working fluid. As the refrigerant circulates around the loop, its internal energy is alternately raised and lowered by a series of device.
Turbine- Turbine engines, are most widely used for jet propulsion and f...


... middle of paper ...


...es upwards and removes all the exhaust gases inside the cylinder at constant pressure.
Carnot Cycle - Carnot’s cycle shows that heat is absorbed from the high temperature reservoir and rejected at low temperature reservoir that can be said as foundation to second law of thermodynamics. The law states that the regular movement of heat is from high temperature tank to low temperature tank, and to move it from low temperature reservoir to high temperature reservoir external work has to be done [1].
Diesel Engine - The Diesel Engine is an application of 2nd law of thermodynamics. It is similar to the Otto cycle, the fuel used is different which makes working of the engine different, thought output is rotational motion .the compression ratio is much high as compared to any other as no spark plug is used only adiabatic compression ration leads to burning of fuel [4].




Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

Energy Is The First Law Of Thermodynamics Essay

- Energy is defined as an exclusive driving force for all physical and chemical changes. Energy exists in many forms such as heat, mechanical work, light, sound, electric, and chemical energy. Energy can be transferred through heat flow, like when a pot of water is put on the stove and the water gets hotter. Something happened here and something changed, hence a driving force for a physical and chemical change. It is important to know that energy does not have mass of a definite shape and these characteristics make it hard to identify....   [tags: Energy, Thermodynamics, Heat, Temperature]

Better Essays
739 words (2.1 pages)

The First Law of Thermodynamics Essay

- 1st Law of Thermodynamics - The first Law is related to conservation of energy in simple words it explains that energy can neither be created nor be destroyed it can be converted from one form to other. Law of thermodynamics defines relations between physical quantities i.e. temperature, energy, and entropy. The relation of these physical quantities can be given in different ways relating with Work, Internal Energy of a system [1]. Applications of 1st law of thermodynamics: Heat Engine – Heat engines are designed on the basic of 1st Law, it is an idealization of a set of processes used by spark ignition internal combustion engines....   [tags: heat engine, converstion, energy]

Better Essays
650 words (1.9 pages)

Essay on First Law of Thermodynamics

- First Law of Thermodynamics The first law of thermodynamics is shared with most of science; it is one of the fundamental principals that have shaped our understanding of the working world. TOTAL ENERGY OF THE SYSTEM AND IT'S SURROUNDINGS IS CONSTANT or ENERGY IS CONSERVED, Brings back that long established idea that nothing can be created or destroyed. How do we know this. This is an empirical law, which means that we know that energy is conserved because of many repeated experiments by scientists....   [tags: Papers]

Free Essays
968 words (2.8 pages)

Order Disorder And The Law Of Thermodynamics Essay

- Order Disorder The laws of thermodynamics are of the utmost importance, in that of all scientific communities, from biology to chemistry to mechanical systems. In all areas of scientific study the four thermodynamic laws define the parameters in which each respectively can function. “Order disorder” this statement is the epitome of the four dynamic laws and that which defines and ardently dominates them.However what does this mean “order disorder”, and what makes it useful to the people not only studying them but also to the people that are using them in their everyday lives....   [tags: Thermodynamics, Temperature, Entropy, Heat]

Better Essays
1522 words (4.3 pages)

Thermodynamics : Thermodynamics And Kinetics Essay

- Thermodynamics and Kinetics Why do people have to understanding what thermodynamics is and what impacts it has in our society. In lecture “ Thermodynamics and Kinetics” of Massachusetts Institute of Technology, Moungi Bawendi focuses his attention on what the definition of thermodynamics is and how its laws are very important to apply to the thermodynamics’ calculations. Bawendi did a good job by saying that it is very essential for students, especially for those from engineering, to understand the thermodynamics’ concepts....   [tags: Thermodynamics, Entropy, Temperature, Heat]

Better Essays
1006 words (2.9 pages)

Understanding of Thermodynamics Essay

- Understanding Thermodynamics Through the Concepts of Absolute Zero and the Distribution of Molecular Speeds Thermodynamics is the study of work, heat, and the energy of a system (NASA, 2010). To help explain in more detail the properties of thermodynamics are the laws of thermodynamics. The first law explains that a system’s internal energy can be increased by adding energy to the system or by doing work on the system (Serway & Vuille, 2012). An internal energy system is the sum of both its kinetic and potential energies....   [tags: conceptr of absolute zero, molecular distribution]

Better Essays
981 words (2.8 pages)

Thermodynamics Essay

- The word thermodynamics is derived from the Greek words therme, meaning heat and dunamis, meaning power. Thermodynamics is a branch of physics that studies the effects of changes in temperature, pressure, and volume on systems at the macroscopic scale by studying the motion of their particles. A system is the subject of study. Heat means energy in transit and dynamics relates to movement of particles; thus, in essence thermodynamics studies the movement of energy and how energy instills movement....   [tags: physics thermodynamics]

Free Essays
1559 words (4.5 pages)

Thermodynamics Essay

- Thermodynamics is the branch of science concerned with the nature of heat and its conversion to any form of energy. In thermodynamics, both the thermodynamic system and its environment are considered. A thermodynamic system, in general, is defined by its volume, pressure, temperature, and chemical make-up. In general, the environment will contain heat sources with unlimited heat capacity allowing it to give and receive heat without changing its temperature. Whenever the conditions change, the thermodynamic system will respond by changing its state; the temperature, volume, pressure, or chemical make-up will adjust accordingly in order to reach its original state of equilibrium....   [tags: essays research papers]

Free Essays
948 words (2.7 pages)

Second Law of Thermodynamics Essay

- The second law of thermodynamics involves the concept of entropy, an idea that explains disorder in our world. The concept of entropy associates useful matter and waste with low entropy and high entropy, respectively. In order to look at entropy, we must first define the system of interest. For the remainder of this paper, the system will be Earth. Many people believe that everything we use up can be recycled and reused if we can develop the appropriate technology. However, the Second Law makes it essentially impossible to achieve complete recycling....   [tags: Chemistry]

Free Essays
431 words (1.2 pages)

Essay on Thermodynamics

- Thermodynamics can be defined as the science of energy. Although every body has a feeling of what energy is, it is difficult to give a precise definition for it. Energy can be viewed as the ability to cause changes. The name thermodynamics stems from the Greek words therme (heat) and dynamics (power), which is most descriptive of the early efforts to convert heat into power. Today the same name is broadly interpreted to include all aspects of energy and energy transformations, including power generation, refrigeration, and relationships among the properties of matter....   [tags: physics science]

Free Essays
1241 words (3.5 pages)