# How do we use combined gas law in everyday life?

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Aug 29, 2015

The combined gas law is $\frac{{P}_{1} {V}_{1}}{T} _ 1$ = $\frac{{P}_{2} {V}_{2}}{T} _ 2$, where ${P}_{1}$ is the initial pressure of the gas, ${V}_{1}$ is its initial volume, and ${T}_{1}$ is its initial temperature in Kelvin; the same variables with "2" as the subscript indicate their values after some change is made.

There are several ways in which this can be handy to you in everyday life:

• Spray cans release pressure when you press the button, causing the gas inside to expand and blow paint all over your neighbor's garage.

Actually, that's about the only example I can think of right now. I'd guess that you probably don't consciously use the combined gas law very often, but that it's hidden away in the machines we like to screw around with.

OK.

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