# What is the relationship between the combined gas law and the ideal gas law?

##### 1 Answer

May 18, 2014

The Combined Gas Law and the Ideal Gas Law are the same relationships written in different ways.

The Combined Gas Law is a combination of Boyle's, Charles' and Gay-Lussac's laws.

The Combined Gas Law joins these to make

The Combined Gas Law should also include Avogadro's Law: "The volume of a gas is directly proportional its number of moles".

Then the Combined Gas Law becomes

If we call the constant

When we rearrange this equation, it becomes

We call this equation the Ideal Gas Law.