A Volume of 3-Torus: Formula and Calculations

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I have recently read that physicists are exploring the possibility that the universe is a 3-torus. I have been trying to find the formula for the volume of a three-torus online but cannot find it. Can anyone tell me the formula?
 
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This statement refers just to the topology. You cannot fix the volume given topology only. In the case of a flat torus, the volume would just be the product of the circumference in its three directions.
 
Thanks for your answer. I was looking for something like the general formula for the volume of an n-ball, which is given here:

https://en.wikipedia.org/wiki/N-sphere

I am not sure whether there would be an analogous formula for the n-torus?
 

Thread '2-sphere intrinsic definition by gluing disks' boundaries'

A sphere as topological manifold can be defined by gluing together the boundary of two disk. Basically one starts assigning each disk the subspace topology from ##\mathbb R^2## and then taking the quotient topology obtained by gluing their boundaries. Starting from the above definition of 2-sphere as topological manifold, shows that it is homeomorphic to the "embedded" sphere understood as subset of ##\mathbb R^3## in the subspace topology.
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