Ice floats in water because, unlike most substances, the solid phase of water is less dense than its liquid phase. When water freezes, it expands slightly, and the resulting change in density is enough to allow ice cubes to float in a glass of water.Know More
Ice's expansion at its freezing point is due to the polar structure of water molecules. In the liquid phase, water molecules are always in motion and can be packed closely together. As the temperature drops, however, the molecules begin to form hexagonal crystals. The hydrogen bonds created in these crystals arrange the molecules in such a way that more space exists between them than in the liquid phase, resulting in an expansion of around 8.3 percent in volume. Since the water the ice displaces now weighs less than the ice itself, ice is buoyant and floats.
This unique property is important to the development of life on earth. Because ice floats, rivers and streams form a layer of ice during winter. If water behaved like most other solids and became denser when cooled, this ice would fall to the bottom of each body of water, freezing it solid and killing any living things under the surface.Learn more about Thermodynamics
Ice floats in water because ice weighs less than water. Since ice weighs less than water, it also has less density, contributing to its ability to float in water.Full Answer >
Ice floats in water because it less dense than water thanks to a special kind of chemical bonding known as hydrogen bonding. Typically solids are denser than liquids of the same substance, such as solid lead, but that is not the case with water and ice.Full Answer >
Styrofoam floats in water because it is less dense than water. This principle applies to all objects. That is, anything less dense than water will float, while anything more dense will sink.Full Answer >
Gases are compressible because they are less dense than other states of matter and have fewer atoms or molecules per unit of volume. Because there is more space between the molecules, it is easy to compress the gas into a smaller space.Full Answer >