The ideal gas assumptions and equation

Only 5

There are a few more assumptions, but you'll probably not be asked to list more than 4. Learn the ones here.

Units

P= Pa or Nm-2
V =m3
T =K ( of course)
n =no units , just a number
R = J mol-1K-1

Brownian motion

There is evidence for the random movement of particles in gas. The evidence comes from the Brownian motion experiment

5 Assumptions

1) Particles move randomly
2) All collisions are elastic
3) There are no attractive forces between particles
4) There are a large number of identicial particles
5) Particles have a neglibible volume

The ideal gas equation

When all the assumptions are considered, and a bit of geometry is carried out you end up with the ideal gas equation.

PV=nRT

P=Pressure
V=Volume
n=number of moles ( fancy way of telling you how much gas there is)
R=molar gas constant
T=Temperature (measured in kelvins)
Are there any ideal gases?

In real life, there are no ideal gases. A gas will behave more like an ideal gas when its temperature is high and its pressure is low. The opposite is also true, a gas will behave less like an ideal gas when its temperature low and its pressure is high.

(c) The Undercover Physicist 2007