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These three laws can be combined mathematically to create $\frac{PV}{Tn} = R$ (R is a constant in the system). When rearranged, this creates $PV=nRT$ or the Ideal Gas Law.  To experimentally obtain a pressure, it is necessary to determine exactly how particles affect the pressure of a system. Pressure is the amount of force over a specific area, also written as $Pressure=F/A$. Force can also be described as change in momentum over change in time: $F = \frac{p}{t]$. \frac{p}{t}$.