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 »

Fresh water freezes at 32 degrees Fahrenheit, which is 0 degrees Celsius and 273.15 degrees on the Kelvin scale. Seawater freezes at a slightly lower temperature than fresh water due to its high salt content. More »

Hot water sometimes freezes faster than cold water, but there is no definitive answer as to why this occurs. Scientists believe many factors may play a role, such as evaporation, supercooling and dissolved gases. 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 »