The volume of a gas is inversely proportional to:
Pressure
Boyle's law states that at constant temperature, the volume of a fixed mass of a gas is inversely proportional to its pressure. Mathematically, \(V \propto \dfrac{1}{P}\) or \(PV = \text{constant}\). Compressing a gas reduces the space between molecules, so squeezing (higher pressure) gives a smaller volume.
At constant temperature and mass, density and mass are not the independent variables in Boyle's law, and time has no direct role in the gas relationship. Only pressure has the inverse link with volume defined by Boyle.
Hence, Pressure.
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'Laughing Gas' is:
