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  1. In addition to water, for which the solid form (ice) is less dense than the liquid form, the element Gallium is also less dense in the liquid state. Gallium can be solid at room temperature but will melt in the hand.

confirmed as solid less dense than liquid:

  • gallium - 5.91 (solid) vs 6.095 (liquid)
  • bismuth - 9.78 (solid) vs 10.05 (liquid)
  • germanium - 5.323 (solid) vs 5.60 (liquid)
  • silicon - 2.3290 (solid) vs 2.57 (liquid)
  • water - 0.917 (solid) vs 0.998 (liquid)

claimed but probably false:

  • acetic acid - 1.266 (solid) vs 1.049 (liquid)
  • antimony - 6.697 (solid) vs 6.53 (liquid) (this "error" is repeated in many places, inc wikipedia)

Water is not always less dense in solid form. Depending on how the water crystals are formed, it may actually be more dense. Examples include HDA and VHDA.

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Q: What substances are less dense when in a solid state than they are in a liquid state?
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Related questions

How do waters relative as a solid and a liquid differ from that of most other substances?

The solid state of water is less dense than its liquid state, which is why ice floats on water. The solid state of nearly all other substances is more dense than the liquid state and sinks in the liquid state.


How do waters relative densities as a solid and a liquid from that of most other substances?

The solid state of water is less dense than its liquid state, which is why ice floats on water. The solid state of nearly all other substances is more dense than the liquid state and sinks in the liquid state.


How do waters relative densities as a solid and a liquid differ from that most other substances?

The solid state of water is less dense than its liquid state, which is why ice floats on water. The solid state of nearly all other substances is more dense than the liquid state and sinks in the liquid state.


How do water relative's densities as a solid liquid differ from that of most other substances?

The solid state of water is less dense than its liquid state, which is why ice floats on water. The solid state of nearly all other substances is more dense than the liquid state and sinks in the liquid state.


How do water and relative densities as a solid and a liquid differ from that of most other substances?

The solid state of water is less dense than its liquid state, which is why ice floats on water. The solid state of nearly all other substances is more dense than the liquid state and sinks in the liquid state.


How do waters relative densities as a solid and liquid differ from that of most other substances?

The solid state of water is less dense than its liquid state, which is why ice floats on water. The solid state of nearly all other substances is more dense than the liquid state and sinks in the liquid state.


How do water relative's densities as a solid and a liquid differ from that of most other substances?

The solid state of water is less dense than its liquid state, which is why ice floats on water. The solid state of nearly all other substances is more dense than the liquid state and sinks in the liquid state.


How do waters relatives densities as a solid and a liquid differ from that of most other substances?

The solid state of water is less dense than its liquid state, which is why ice floats on water. The solid state of nearly all other substances is more dense than the liquid state and sinks in the liquid state.


How do water relative densities as a solid and a liquid differ from that of most other substances?

The solid state of water is less dense than its liquid state, which is why ice floats on water. The solid state of nearly all other substances is more dense than the liquid state and sinks in the liquid state.


How do water's relative densities as a solid and a liquid differ from of most other substances?

The solid state of water is less dense than its liquid state, which is why ice floats on water. The solid state of nearly all other substances is more dense than the liquid state and sinks in the liquid state.


How do water relatives densities as a solid and a liquid differ from that of most other substances?

The solid state of water is less dense than its liquid state, which is why ice floats on water. The solid state of nearly all other substances is more dense than the liquid state and sinks in the liquid state.


How do water's relative densities an a solid a liquid deffer from that most other substances?

Solid water, ice, is less dense than liquid water and floats on top. The solid state of other substances is more dense than the liquid state and will sink in the liquid.