# Thermodynamics

The laws and principles of thermodynamics govern the field of Mechanical Engineering. Whenever an engineer wants to design a motor or system they must take into account laws of energy, motion and friction that will effect how the machine works. Learn more about this field, including the basic laws and rules, and how to apply these rules to the development of machines and technologies.

## Third Law of Thermodynamics – This Less Used and Understood Law Explains What Happens at Absolute Zero Temperature

The third law of thermodynamics is least used among the three laws of thermodynamics. It says that the entropy of the pure crystal becomes zero at absolute zero temperature or zero degree Kelvin. Let us see the details about absolute zero temperature, entropy and the law.

## Zeroth Law of Thermodynamics Came After the Other Laws Although it is More Basic

Zeroth Law of thermodynamics is very simple to understand. It says that when two bodies are separately in thermal equilibruim with a third body, then the two bodies are also in thermal equilibrium with each other. This law has been used as the basis for measurement of temperature.

## What is the First Law of Thermodynamics?

Humans beings consider themselves as highly creative people since they have carried out most of the developments in the present day world. However, for the most basic needs we are still entirely dependent on nature. Let’s see how first law of thermodynamics mocks all our claims of creation of work.

## The Second Law of Thermodynamics: Heat Falls from Higher to Lower

The well known fact that it requires lots of efforts to go against the nature has been highlighted in second law of thermodynamics. It states that heat flows from body of high temperature to the body of low temperature. You need external work to move the heat in opposite direction.

## Definition of Thermodynamics – How Energy is Converted From One Form to Another

Since early days mankind has been utilizing energy in various forms and knowingly or unknowingly converting it from one form to the other. Thermodynamics is the branch of science and important subject of Mechanical Engineering which studies conversion of energy from one form to the other.