Ideal Gas Law
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The ideal gas law, or universal gas equation, is an equation of state of an ideal gas. It combines several gas laws (i.e., Dalton’s Law, Boyle’s Law, Charles Laws):
PV = nRT
P is the pressure of gas in pascals V the volume it occupies in cubic meters T the temperature of the gas in degrees Kelvin n is the molar mass of the gas occupying the volume V R is the gas constant
R = 0.0821 
or 8.314 
The equation is valid only for an ideal gas. Real gases obey this equation only approximately, but its validity increases as the density of the gas tends to zero.
