Have you heard of a 'multiplication triangle'? Since there are quite a few formulae of the form X = Y/Z, there's a nifty trick if you haven't got the hang of rearranging.
The concept is usually taught using the distance, speed and time example. Draw a triangle:
/\
/ D\
/S|T\
To find a term, cover it and read the remaining items, e.g. distance D = ST = speed*time.
time T = D/S = distance / speed
Incidentally, to rearrange I find it helps to do the following: pick the term you want to be on its own. Remember that anything you do to one side of the equals sign you
must do to the other. Refer to Backpacker's post for how this works.
@McAero - surely the temperature affects the density therefore doesn't need to be factored in at this point? Higher temp => lower density. Density in kg/m3 doesn't involve temperature so by definition
must be equal to the mass in kg divided by volume in m3.
Oh btw Backpacker - nice quote, I like it
