Q. How fast do molecules in water move?
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A. How fast water molecules move depends on the temperature of the water. If the water is frozen, as in an ice cube, the molecules move very little and, in fact, are pretty much locked together. If the ice melts, the molecules move more quickly, but they're moving quickly. The molecules in cold water move arround at about 1,200 miles per hour. In hot water, the speed is about 1,600 miles per hour. When water is heated to the boiling point (which is 212 degrees at sea level), the water molecules begin to move so fast that they can rip apart from each other and fly off into the air as steam.