Aproperty is a characteristic of a substance that can be observed and does not change the identity of the substance.

The given blank can be filled with physical.

Explanation:

A characteristic of a substance, which does not comprise realignment of atoms and deals only with the shape, size, and the state of the substance is termed as its physical property. Therefore, the identity of the component does not get modified. For example, hardness and melting point.  

On the other hand, chemical property refers to the characteristic of a substance that comprises realignment of atoms, and thus, the formation of new substances takes place. Therefore, the identity of the substance gets modify. For example, precipitation and oxidation.  

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