# What is the First Law of Thermodynamics? Give 1 situation wherein the first law can be applied and explain how it is applied.

What is the First Law of Thermodynamics? Give 1 situation wherein the first law can be applied and explain how it is applied.
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Thermodynamics is a field of physics that deals with the thermal properties of a body to classify, study and predict its behavior. It uses statistical quantities like temperature, pressure, volume, heat capacity, among other quantities to study the body.
It includes several laws which give different incites about the system. It is a very interesting fact that the first law of thermodynamics was written before the zeroth law. Zeroth law being a more basic law was to come before first law, hence named the zeroth law.
Solution:
The first law of thermodynamics is nothing but conservation of energy. We know that energy stays conserved and is not converted from one form to another. The first law of thermodynamics says that the change in enthalpy is equal to the difference between the change in internal energy of a body and the work done by it. It can be written as follows:
$dH=dU-dW$
Here,
Change in enthalpy corresponds to the heat exchange.
We see a lot of application of the first law of thermodynamics, but we will look at the first law.
One of the examples is the heat engine in which the heat is converted to mechanical work.
So, the heat that you give to the engine is converted to the internal energy and work done by the system.
A type of heat engine is an internal combustion engine. The heat is added through the combustion of fuel which is converted to the internal energy of the gas. The gas then expands to convert the internal energy of the gas to work.