Volume:
All gases have to be enclosed in a container that can be sealed with no leaks. The space in that container is the volume. In Chemistry, volume is usually measured in liters or milliliters.
-Whenever units of volume are used, use them all the way through the problem.
In Boyle's law, the volume is a variable. This means that the container involved in the experiment has a movable wall. When the volume goes up, that wall slides out. When the volume goes down, that wall slides in.
If the volume is constant, then the container is made with thick, rigid walls that cannot move. …
