There are many well-known equations in the world of physical science; the most well-known is probably E=mc2. There is a lesser-known equation that has been experienced by many of us.
Have you ever moved everything out of a room in your house in order to paint the room or relocate the contents to another location for some other reason? When you do this, there seems to be more "stuff" when you get it moved.
The less-known but more experienced equation is MS (moved stuff) = V2 (volume doubles).
It will prove itself to you if you test it in your own real-world situation.