Question

Why does steam have lesser mass than ice?

Answer 1

In the gas/vapor phase, molecules have very little interaction with each other and they are at large distance, whereas in liquid and solid, molecules are in continuous contact with each other. It is therefore clear that there are more molecules per liter in ice than in water vapor, and therefore the density is larger.

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Answer 2

Answer:

Since the molecules of gaseous state(steam) have lesser force of attraction and so the inter molecular space increases hence on application of heat the density decreases but this does not contradicts the law of conservation of energy. The steam doesn't have less mass than ice only some of the mass is released as heat. Hence, the total mass of the system is conserved.