physical properties
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance.
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a physical change
A physical property can be observed without changing the substance into something else.
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The specific gravity of a substance is the ratio of its density to the density of a reference substance (usually water). Specific gravity is a dimensionless quantity that allows us to compare the density of different substances without units.
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physical
A physical state is physical and not chemical Physical Property is observed without changing a substance into another substance. Chemical property is the ability of a substance to change into different substance.