Question

Why is ideal gas law important?

Answer 1

In order to know why the ideal gas law is important, we must have an idea about what an ideal gas and ideal gas law is. Ideal gases are those gases which do not exist in reality. Ideal gas is said to be a theoretical gas which moves in all directions. Ideal gases will not attract or repel each other and these gases do not take up volumes for themselves.

Complete answer:
Let us first understand about the ideal gas. Ideal gases are those gases which do not exist in reality. Ideal gas is said to be a theoretical gas which moves in all directions. Ideal gases will not attract or repel each other and these gases do not take up volumes for themselves. The gases which follow all the gas laws under the conditions of temperature and pressure is called ideal gases.
The ideal gas equation is given below:
i.e., $PV = nRT$
where P is the pressure, n is the number of moles, R is the gas constant, V is the volume and T is the temperature of the gas.
Ideal gas law is a law which will give the relationship between the temperature, pressure and density.
The theory behind this gas law is that the gas molecules will undergo elastic collision in a container which has a fixed volume, in which the gases will not take up any of the available space. Though it sounds odd, for many gases this is a good approximation method. In the ideal gas law, we can get the correct answer within 1% accuracy.

Note:
We have to remember that the real gases are different from the ideal gases. Real gases are those gases which obey the gas laws at only low pressure and high temperature. The real gases usually obey Van der Waals equation:
$\left( {P + \frac{{a{n^2}}}{{{V^2}}}} \right)\left( {V - nb} \right) = nRT$