How to define t² when writing quantity and unit notation

[epsilon]

I am writing a lab report as part of my degree and, of course, it must be in the standard scientific paper format.

I have come up against something that isn't particularly difficult but something that you must get correct for papers. I am defining quantities and their units, however I am not sure how to define the quantity when it is not in its usual form.

The situation is that normally you would say: t = time (s).
So how do you say t²?
Would it be: t² = time (s²) OR t² = time² (s²)?

Many thanks!

 

[Vanadium 50]

I don't understand. Once you have defined t, you have also defined t squared.

 

[mfb]

I agree with Vanadium 50. Define t, done.