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Answer to Question #18831 in Inorganic Chemistry for Ahmed Ali

Question #18831
What is it meant by boiling and melting for gases?
Expert's answer
What is it meant by boiling and melting for gases?

The boiling point is the temperature at which something changes states between gas and liquid - thus, whether or not something is a gas is irrelevant to the boiling point. The boiling point can also be referred to as the point of condensation - condensation is the point at which a gas becomes a liquid, boiling when a liquid becomes a gas.

The melting point is the temperature at which a substance changes states between liquid and solid - can also be known as the freezing point or point of solidification.

As an example, nitrogen is over 70% of our atmosphere, and is a gas at room temperature (usually around 20 degrees Celsius). However, its "boiling point" is -195 degrees Celsius. If you cool it all the way down to -195, it would condense - become a liquid. If you managed to cool it beyond that, to -215 degrees Celsius it would become a solid.

So, the "boiling" and "melting" points are simply the same as the point of condensation and freezing point.

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