Why Time is considered a 4 th dimension ? Why Gravity cannot be considered as a dimension ? What is a 5th dimension ?
In: Physics
Relevant video: https://youtu.be/3KC32Vymo0Q
A dimension just means something that has an independent measurement. We say we live in a 3-dimensional world because we cannot make a construction which has more than 3 lines which are all at right angles with each other.
Time can be thought of as a 4th dimension because, just as an object’s location in space can be represented as 3 coordinates (x, y, z), an object’s motion can be represented as 4 coordinates (x, y, z, time).
For most practical purposes, we only have 3 _spatial_ dimensions, but we can keep adding dimensions as long as each dimension is independent of the other dimensions. E.g. a point in 5-D might be an object’s location (x, y, z) at a given time (t) with a given color (c) thus producing a coordinate system of (x, y, z, t, c). I haven’t the faintest idea why that might be useful, but it’s logically* possible.
Edit: *logically = mathematically
Latest Answers