# What is the difference between first and second laws of thermodynamics?

##### 1 Answer

#### Answer:

I will explain the laws of thermodynamics in the simplest way possible.

#### Explanation:

There are four laws in Thermodynamics namely, the **zeroth law**, **1st law**, **2nd law** and **3rd law**.

This states that if system A is in thermal equilibrium (no observable change) with system C and system B is also in thermal equilibrium with system C then system A must be in thermal equilibrium with system C.

Or mathematically, if A = C and B = C then A = B.

Also known as the law of conservation of energy. This law states that energy *cannot be created nor destroyed*. In other words, the total amount of energy *coming in the system* must be equal to the total energy *coming out of the system*. The energy might be transferred and transformed but it must remain constant.

states that in the natural flow of things, the system always favors *chaos* rather than order. In other words, the entropy (amount of disorder) in a given closed system *irreversibly increases* and the total amount of entropy is the sum of entropies between the system and its surroundings.

states that the entropy of a perfect crystal system at *absolute* temperature (0 Kelvin) must be equal to zero. This law states the impossibility of a perfect system as even crystals (which has the most rigid and ordered structure) has to be *perfect* and in absolute zero temperature to have a zero entropy.

Hope these helps.