The one that is not a property of gases is the number of gas particles in the sample. The correct option is B.
What is gas?
Gas is a state of matter that does not have a defined shape or volume. The atoms of gases are far from each other. Pure gas is made up of only one type of atom.
The properties of the gas are volume, pressure, temperature, and mass. All gases are not diatomic. Argon is a gas that is not diatomic. The number of particles in a sample can be a mixture of an experiment.
Thus, the correct option is B. number of gas particles in the sample.
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