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→Melting point
: ''Main Article: [[Melting point]]''
: ''Main Article: [[Melting point]]''
The melting point of any pure substance is the temperature at which, under common atmospheric pressure, that substance changes its state from solid to liquid. If the substance is a liquid at 25 degrees Celsius, this temperature is usually called the ''freezing point''. Some substances, all of them compounds, will simply decompose before they ever melt.
The melting point of any pure substance is the temperature at which, under common [[atmospheric pressure]], that substance changes its state from solid to liquid. If the substance is a liquid at 25 degrees Celsius, this temperature is usually called the ''freezing point''. Some substances, all of them compounds, will simply decompose before they ever melt.
=== Boiling point ===
=== Boiling point ===