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What is a phase change? A phase change occurs when a substance changes state. There are two types of phase changes: boiling and freezing. When water boils, it changes to steam or vapor; the steam has taken up more space than the water did, so it occupies less volume in its container. Freezing happens when liquid turns into ice; this transformation requires heat energy because the molecules must be moving fast enough for them to break away from one another and form crystal structures that have less volume than the original liquid had. is what below go might body their then not If). soupor ( tea or coffee like drinks hot and clothes warm with well pack to need would they weather cold in hike a on going were someone if, exampleFor
