____ can exist in different ____, and the transitions between them are driven by changes in ____. When a solid absorbs enough ____ to reach its melting point, it becomes a liquid. The opposite process, where a liquid loses enough energy to become a ____, happens at its ____ point. A liquid can also turn into a ____ through evaporation, which occurs at the surface, or by reaching its ____ point, where the change happens throughout the ____, releasing bubbles. The reverse of these processes is ____, where a gas cools and becomes a liquid. Some substances can ____ a state entirely. For example, ____ is the direct change from a solid to a gas, like dry ice turning into a vapour without first ____. The reverse process is called deposition, where a gas turns directly into a solid, as seen in the formation of ____. Finally, ____ is the process where particles of one substance spread out to ____ evenly with particles of another, like a drop of food colouring ____ through a glass of water, regardless of the state of matter.

iGCSE States of Matter

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