Hey Ray! Explaining How Air Molecules Make Things Appear Empty

A Pessimist would say this glass is half empty, while an optimist would say that same glass is half full.
In the science world, though, scientists would say that glass is full!
(Photo Credit: Ray Petelin)
The thing about containers is they are full, even when they look empty.
They are full of air molecules.
This air tries to fill every empty space, like the container.
When you pour in a liquid into a container, you are just displacing the air molecules that were in the glass with the liquid, or