Only Helium will not freeze all other substances will freeze if cold enough, but fluids like cooking oil, antifreeze, petrol ( gasoline), nitrogen, etc. When most materials reach a temperature called the freezing point, the molecules form a crystalline solid - although some materials (like glass and tar) do not crystallise at all but form super stiff fluids, which seem to be solid. When materials are cooled their molecules vibrate less and compact together. Water freezing in rock cracks can expand enough to split hard rocks apart this is an important geological weathering process that can wear down mountains and make rock into soil. Water in glass bottles can make them explode when it freezes. If water in plumbing freezes, it can burst the water pipe. The molecules in an ice crystal are arranged in a way that makes it less dense than liquid water. This is because the water molecules are actually farther apart instead of being closer together. Liquid water expands by about 9% as it becomes ice - it takes up more space. This is very unusual - just about every other liquid gets more dense as it cools water ice, however, is an important exception. Unlike other liquids, water expands as it freezes to become ice so ice floats on water because ice has less density than water.
0 kommentar(er)
