Changes of State

Science, Grade 7

Changes of State

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1. Changes of State
Sublimation is a process that occurs when a material changes from a solid directly into a gas. An example is dry ice, which is extremely cold and is composed of carbon dioxide. When dry ice is removed from a freezer, it acquires thermal energy from the warm air surrounding it, and the solid changes directly to a gas. The cold gas causes water vapor in the air to condense and form fog.