## Zeroth Law of Thermodynamics

Equation #15: Zeroth Law of Thermodynamics In thermodynamics, being in thermal equilibrium with another body is nothing but a way of saying that the two bodies are at same temperature (definition of temperature). Basically, this law states that if two

## Thermodynamics: Ideal Gas

Why are gases important? The gaseous state of matter behaves differently from solids and liquids. It is neither limited in volume nor in compressibility. A gas fills entire volume of the container it is kept in, and distributes itself uniformly.

## Second Law of Thermodynamics

The second law of thermodynamics is very useful because it can not only help us design efficient machines but also explains the arrow of time(which direction a process will follow). This law has been stated at least in three different

## Macrostates vs Microstates

The microstate describes a system completely and exactly in terms of the positions and velocities (or other degrees of freedom) of all of its constituents. Hence for a bowl of water, the microstate will tell you exactly where each molecule

## Stefan-Boltzmann Law

Equation #8: Stefan-Boltzmann Law From gamma rays to infrared to radio, we have the whole range of frequencies of electromagnetic radiation. An ideal body (although for practical purposes we can take the Sun to be one) absorbs (and emits) radiation