Density is a constant value because it doesn't vary. For example, the density of liquid water is constant that is about 997 kg/m³.
What is physical property?
The measurable property of matter is due to its physical state. These properties are often observable.
Temperature is a physical property that tells about the kinetic energy of the particles of given matter and it can change.
Sige and phase are also can vary such water found in all three states.
Density is a constant value because it doesn't vary. For example, the density of liquid water is constant that is about 997 kg/m³.
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