gaspyknometer
A gas pyknometer is a laboratory instrument used to determine the density of a solid or liquid by measuring the volume of a gas that displaces a known mass of the substance. This method is particularly useful for porous or finely powdered solids that are difficult to measure accurately with traditional liquid displacement methods. The pyknometer typically consists of a sealed container with a known volume and a mechanism for introducing the sample and a non-reactive gas, often helium.
The principle behind the gas pyknometer relies on the ideal gas law. By measuring the pressure and