Why does spray deodorant come out of the can so cold, even though it is kept at room temperature?

Question

Why does spray deodorant come out of the can so cold, even though it is kept at room temperature?

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Answer 1

***Gay-Lussac’s law of pressure–temperature*** describes the relationship between the pressure and temperature of a fixed mass of gas kept at a constant volume.

> *The pressure of a gas of fixed mass and fixed volume is directly proportional to the gas’s absolute temperature.*

> **P** = ***k***•**T**

As the pressure of a gas rises/falls, the temperature does the same.

Decrease the pressure (spray the deodorant) and the temperature decreases.
Increase the pressure (pump up a bike tire) and there’s an increase in temperature.