This turns out to be a very profound question. And the answer has two parts. You might have to ask your mom or dad to help you with some of the videos.

Let’s start with trying to figure out what “empty” means. Imagine you have a box of some kind. For example like this

Now this box isn’t empty. A penguin is in it but if we removed the penguin we’d get a box something like this

which people normally think of as empty. However to a physicist the box isn’t really empty because the box is full of air. The space inside the box just looks empty because we cannot see the air but it’s there. The air is contained inside the box and the inside of the box is called the volume of the box. The box has a width, a length and a height and these three things determine the box’s volume. The width, length and height of a box are called the box’s dimensions. The bigger the dimensions are then the larger the volume.

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Tags: Physics, Science

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