Thanks very much for the detailed explanation, Jonny.

<< if you take the 4th root, then you reduce it to a very weird unit of metres raised to the power of one half, i.e. square-root metres, which is like an inverse area, which may be fun in maths, but has little physical meaning in the real world. >>

I guess that's answered my question!

(I think it's back to the ironing-board for me ... )

Hermione
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