When water freezes, the molecules slow down and assume a fixed position, although not quite in the way that one might think. Water is made of molecules with two hydrogen atoms and an oxygen atom, but those molecules don'... More »

Freezing water causes the volume to expand. Putting 9 milliliters of water through the freezing process leads to a volume of approximately 9.1 milliliters of ice. This is not a huge expansion, but it is significant enoug... More »

When you freeze fresh fruit, you preserve its color and flavor, stopping the ripening process when the fruit is at its best. However, freezing affects fruits’ texture, breaking down and softening meats because water expa... More »

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Water boils when the thermal energy in the water, which is a type of kinetic energy which causes the water molecules to move around, exceeds the strength of the hydrogen bonds between the molecules, causing them to separ... More »

Hot water freezes faster than cold water, a phenomenon known as the Mpemba effect. The effect is named after a Tanzanian high school student who provided an interesting parable about this phenomenon in 1969. More »

Pure water freezes at 0 degrees Celsius at 1 atmosphere of pressure. The freezing point of salt water is lower and depends on the concentration of salt. More »

When water vapor cools, it condenses. It is a phase change where water changes from a gas to a liquid. Condensation is the opposite of evaporation. More »