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Im pretty sure its the first one

Physical properties are those properties which can be observed without changing the identity of the substance.

What are Physical properties?

The physical properties is a substance can be defined as those properties of a substance that can be observed and measure such as:

  • size

  • shape,

  • volume.

Therefore, Physical properties are those properties which can be observed without changing the identity of the substance.

Learn more about physical properties here:

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