The Nature of Gases. Regardless of their chemical identity, a ll gases display similar physical behavior. Examples of gases. A particle of gas can be: A single atom He Ne Ar A diatomic molecule H 2 I 2 O 2 A polyatomic molecule CO 2 CH 4.
Regardless of their chemical identity,
all gases display similar physical behavior
n= number of moles
n = mole = mass (g) / molar mass (g/mol)
V = volume = liters = L
T = temperature = 0C = K
The Kelvin scale uses the same size degrees, but it starts at absolute zero, -273.2 0C.
T (K) = 0C + 273.2
P = pressure = different units are used
One pascal is small, so we often use kilopascals, kPa
STP stands for
Standard Temperature and Pressure