There are a lot of conventions in physics and math and they come to the rescue. In the CONTEXT of gases, it's easy to realize that V must be volume, T must be t

There are a lot of conventions in physics and math and they come to the rescue. In the CONTEXT of gases, it's easy to realize that V must be volume, T must be temperature, etc. The formula PV = nRT is for physicists, not for "anyone else".