## Ideal Gases

An ideal gas obeys PV/T = constant or PV/T = P

_{o}V_{o}/ T_{o}exactly.P, V, and T are known as "state variables" for specifying two of them fully determines the "state" or condition of an ideal gas.

The ideal gas law can be written as PV = nRT where n specifies how much gas is being considered and R is a universal constant.

"State variables"

This is known as the

ideal gas law.N = number of gas molecules k = Boltzman's constant

k = 1.38 x 10

^{-23}^{J}/_{K}

n = number of molesA mole of gas molecules is Avagadro's number N

_{A}of molecules,N _{A}= 6.02 x 10^{23}[ N = n N

_{A}]R = universal gas constant

R = 8.314 J/mole-K

For constant pressure, an increase in temperature brings about an increase in volume, according to

(c) 2005, Doug Davis; all rights reserved

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