What is meant by the fourth dimension?© BrainMass Inc. brainmass.com September 24, 2018, 1:17 pm ad1c9bdddf - https://brainmass.com/physics/cosmology/fourth-dimension-106508
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 ...