Question

what do you mean by ideal gas? why is 𝑝𝑉 = 𝑛𝑅𝑇 called â€perfect’ or â€ideal’ gas equation?

Answer 1

What is an ideal gas?

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23 ANSWERS



John Owen, Old, retired Chem Prof

Answered Dec 18, 2017 · Upvoted by Steven Merz, PhD Candidate in Chemical Engineering · Author has 154 answers and 161.7k answer views

Originally Answered: What is an ideal gas?

There is no such thing as an ‘ideal’ gas. A gas at a certain temperature and pressure might behave ideally, and at a different temperature and pressure not behave ideally.

A gas behaves ideally if its state can be described by the ideal gas equation:

PV = nRT where P = pressure, V= volume, n = chemical amount, R = ideal gas constant and T = temperature.

The ideal gas equation assumes two things:

The volume of all the gas molecules is zero. In other words, each and every molecule has the whole volume of the container to move around in.There are no attractive forces between the gas molecules.

We call a gas whose state cannot be described by the ideal gas equation, a ‘real’ gas.

There is no equation that describes the state of a gas at all temperatures and pressures. There have a lot lot of attempts: