# Ideal Gas Law and Kinetic Theory

## Key Questions

The ideal gas law states that $P V = n R T$.

#### Explanation:

The ideal gas law gives the relationship between a substance's mass, volume, its current temperature, the amount of moles of the substance, and the pressure it is currently in, by a simple equation.

In my words, I would say that it says that:

The product of the pressure and volume of a substance is directly proportional to the product of number of moles and the temperature of the substance.

For the symbols:

$P$ is the pressure (usually measured in $\text{kPa}$)

$V$ is the volume (usually measured in $\text{L}$)

$n$ is the amount of moles

$R$ is the ideal gas constant (usually use $R = 8.314 \cdot \setminus {\text{L" \ "kPa" \ "mol"^-1 \ "K}}^{-} 1$)

$T$ is the temperature (usually measured in $\text{K}$)

Note that no ideal gases are found to exist, but we can still use this equation for real-life gases, as they behave like ideal gas at low pressure and temperatures. But remember that, in real life, no gas will perfectly obey the ideal gas law.

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