How can the volume of a gas be measured?
Measure the volume of the container it is in.
The volume will always be different so it is inaccurate and cannot be measured.
Gas is insoluble in liquid so it can be determined by displacement.
The volume can be calculated once the mass is determined.
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The volume can be calculated once the mass is determined.

Explanation:

Gas is a fluid that can be compressed, therefore knowing the volume of the container is not sufficient reason, to determine the volume. That is why it is important to always know the mass of the gas since the mass can not be destroyed will always be conserved the same. So if we have a gas in a container, and if we know its temperature and pressure, we can determine its specific volume, once this property is determined, we can calculate the volume by knowing the relationship between the specific volume and the mass of the gas.

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frequency or wavelenth of em radiation in a vacuum