Matter most commonly exists in four states that are grouped together as the common phases of matter. Which set names all four?
ASolid, liquid, gas and plasma
BSolid, liquid, gas and vapour
CSolid, liquid, foam and plasma
DSolid, powder, gas and plasma
Answer & Solution
Correct answer: A. Solid, liquid, gas and plasma
1. Matter most commonly exists as a solid, a liquid, a gas or a plasma, and those four states are the common phases of matter.
2. A vapour is simply a gas, so it is not a separate phase alongside the gas phase.
3. Foam and powder are mixtures of a solid with a fluid rather than phases in their own right.
4. Only solid, liquid, gas and plasma names the four common phases.
_Source: OpenStax College Physics (CC BY 4.0), Ch 11 "Fluid Statics", section 11.1 What Is a Fluid?_
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