Q:

Does ice weigh more than water?

A:

Quick Answer

In general, if ice and water have the same volume, then the ice weighs less. This is because ice is less dense than water and occupies more space. Therefore, a gallon of ice weighs less than a gallon of water.

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Does ice weigh more than water?
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Full Answer

When water freezes into ice, the individual water molecules expand to occupy more space, increasing in volume by about 9 percent. As the liquid turns into a crystalline solid, the water molecules stay expanded and mesh together to form a solid. Due to this phenomenon, the same volume of ice and water have different masses and different densities. For this reason, ice floats in water.

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Related Questions

  • Q:

    Why is the freezing of water called a physical change?

    A:

    Water freezing into ice is a physical change because the hydrogen and oxygen molecules that make up the water stay the same, despite the change in state from liquid to solid. A physical change is simply a change in the material's physical properties, such as shape or phase.

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  • Q:

    Why is ice less dense than water?

    A:

    When water is frozen into ice, the change in temperature creates excess hydrogen bonds between water molecules that increase the space between the molecules. The additional space created reduces the density of the water as it freezes, making ice less dense than water. Rather than the molecules packing more tightly together and creating a heavier density, as water freezes the hydrogen bonds increase from a 3.4-molecule bond to a 4-molecule bond, which creates the excess space and reduced density in ice.

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  • Q:

    How does the way water changes from one state to another compare to the way other substances change?

    A:

    The most unusual thing about the way water changes from one state to another is that its liquid state is denser than its solid state, so increased pressure actually encourages ice to melt. This is unlike most substances, in which increased pressure encourages solidification because the solid state is the most dense. Water also requires a great deal of energy to change its physical state, more than most substances require.

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  • Q:

    Why is it good that ice floats and doesn't sink?

    A:

    It is good that ice floats on water because plants and fish can survive in water that is covered by the floating ice sheet. Water in its solid state becomes less dense than in its liquid state, unlike other matter types, due to its hydrogen bonding.

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