Molecular Model of an Ideal Gas

As the number of moles n increases, pressure p increases.
As temperature T increases, pressure p increases.
As volume V decreases, pressure p increases.

The pressure p, volume V and temperature T of a gas are related by the formula:
p V = n R T
where n = number of moles of molecules
and R = molar gas constant = 8.31 J kg-1 K-1

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