Boiling point is an example of what?

Correct answer: Physical property

Direct answer: A, physical property. A physical property is a characteristic that can be observed or measured without changing a substance into a new substance. The boiling point is the temperature at which a liquid’s vapour pressure equals the surrounding pressure and the liquid boils; during ordinary boiling, the liquid changes to gas but its chemical identity remains the same. Therefore boiling point is a physical property, and A is correct. Option B, chemical change, is wrong because boiling does not normally create a new substance; water vapour is still H2O. Option C, only smell, is wrong because boiling point is a measurable temperature, not an odour. Option D, only colour, is wrong because colour is a different physical property and does not define boiling point. In distillation, substances are separated partly because they have different boiling points. Memory cue: melting point and boiling point are physical properties because they describe state changes, not new substances.