# Does Boyle’s Law state that as volume increases, pressure decreases or as pressure increases, volume decreases?

Boyle's Law states both that as volume increases pressure decreases and that as pressure increases volume decreases.

#### Explanation:

Boyle's Law states that pressure and volume are inversely proportional, but also assumes that the material is a confined gas (so no amount of gas increases or decreases) and the temperature remains steady.

Mathematically, it can be stated a couple of ways:

$P \propto \frac{1}{V}$

or

$P V = k$ where $k$ is a constant

And so Boyle's Law states both that as volume increases pressure decreases and that as pressure increases volume decreases.

https://en.wikipedia.org/wiki/Boyle%27s_law