A given substance’s latent heat, at its normal phase-change temperature and pressure, is best described as?

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1. A given substance’s latent heat, at its normal phase-change temperature and pressure, is best described as?

A value that varies randomly with the mass undergoing the change

A fixed, characteristic constant for that substance under those conditions

A quantity with no defined numerical value

A property identical across all substances

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Latent heat is a fixed property of a given substance at a specific phase-change temperature and pressure — for instance, water’s latent heat of vaporisation is about 540 calories per gram at 100°C.