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Fourth Dimension

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What is meant by the fourth dimension?

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When we look at our world, we describe objects as three dimensional.

We can see that an object has certain length, width and height.
The same for a coordinate system. We can describe any point in space with three numbers (the simplest is the x,y and z coordinates).

However things in the world are not static. Objects move from one place to another, materials can change phase (water to ice for example).

Hence when we describe a physical process, it is not enough to describe its three dimensional aspect, but also the *time ...