# Thread: 4th dimension

1. Is the 4th dimension time or space?
About half the scientific community thinks its space(x,y,z,a) while the other half thinks its time(Einstein).

Here is a model of space-4d

but

"The fourth dimension is often identified with time in physics, and as such is used to explain the non-Euclidean space-time used in Einstein's theories of special relativity and general relativity." - wikipedia

Is the 4th dimension time or a spatial 4th dimension?

2.

3. correct me if i'm wrong, but i always thought it was time...

4. Time is a concept applied to the 4th dimension. Time is not THE 4th dimension.

The 4th dimension is the object as it exists between one point and another. This can be conveniently measured with time, although the actual 4th dimension is not time.

See if this helps: TenthDimension.com

5. Originally Posted by DivideByZero
Here is a model of space-4d
This is a two-dimensional representation of a 4-dimensional hypercube, an object which requires at least 4-dimensions of space.

6. Originally Posted by Wolf
Time is a concept applied to the 4th dimension. Time is not THE 4th dimension.

The 4th dimension is the object as it exists between one point and another. [/url]
Ah, thank you for clear that up for me

7. Very informative article from http://tetraspace.alkaline.org/time.htm

There is a raging debate going on (and probably will go on forever) about whether the fourth dimension is time, or whether it is a 4th spatial dimension. It is not the point of this site to claim that the fourth dimension is spatial instead of being time. The point of this site is to speculate about what a fourth *spatial* dimension would be like, beyond our three spatial dimensions.

To humans going about their everyday lives, time is fundamentally different than the three spatial dimensions, since only one direction is possible with time. Some have argued that this is only because of our limited perspective. Indeed, time actually behaves like a spatial dimension when you consider it in special relativity. You can get into some quite complex, interesting, and paradoxical discussions about weird things happening with time as a dimension. However, that's not what this page is about.

Some people use the term "fifth dimension" to refer to the fourth spatial dimension. The terms "fourth dimension" and "fifth dimension" are only labels though, and you could just as easily refer to time as "gerbil land" and the fourth spatial dimension as "hamster land". Throughout these pages I refer to the fourth spatial dimension as "tetraspace". That way, there can be no debate about whether the fourth dimension is time or spatial, since the term "tetraspace" has "space" within the name.
I started this topic because some people believe the forth dimension is time only and can not be represented as a hypercube, while others think that the 4th dimension is just one more axis (x-axis, y-axis, z-axis, and then a-axis). Both ideas are correct, but we never think of a hypercube with a dimension of time.

heres a pic of what many think:

8. They key is to understand what "time" is. Time is nothing more than a conceptual label applied to indicate change. Time itself is nothing. You cannot have simply time, itself. Unfortunately, the convenience of "time" makes it easier to conceptualize than trying to conceptualize an object in the 4th dimension.

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