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Both steam and liquid water are made of the same substance (H2O). However, in the gaseous form (steam), the molecules are moving more quickly, and they are spread apart much farther. As such, the number of molecules per given volume (the mass per volume) is lower for steam. Mass per volume is the same thing as density.

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11y ago
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5mo ago

Steam is less dense than liquid water because steam is in the gaseous state, while water is in the liquid state. The molecules in steam are farther apart and have more kinetic energy compared to liquid water molecules, which results in steam having a lower mass per unit volume.

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15y ago

Steam is less dense, so it contains less molecules of water in the same amount of area.

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Q: Why does steam weigh less than water?
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