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How does matter change when it is heated or cooled?

Answer 1

Cameron Andrews

Just to retire this question....

When matter is heated, it usually transitions from a condensed phase—a solid or liquid—to a gas.

#"Solid"+Delta_1stackrel("melting")rarr"Liquid"+Delta_2stackrel("boiling")rarr"Gas"#

And when the substance cools, the opposite holds true.

#"Gas"stackrel("condensation")rarr"Liquid"+Delta_2stackrel("fusion")rarr"Solid"+Delta_1#

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Answer 2

Owen Ambrose

When matter is heated, its particles gain energy and move faster, causing the substance to expand. When matter is cooled, its particles lose energy and move slower, causing the substance to contract.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.