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A physical property is a characteristic of matter that is not associated with a change in its chemical composition . Familiar examples of physical properties include density , color , hardness , melting and boiling points , and electrical conductivity . We can observe some physical properties , such as density and color , without changing the physical state of the matter observed . Other physical properties , such as the melting temperature of iron or the freezing temperature of water , can only be observed as matter undergoes a physical change . A physical change is a change in the state or properties of matter without any accompanying change in its chemical composition -LRB- the identities of the substances contained in the matter -RRB- .
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