If the fundamental quantities are velocity -v- I length- r radius and p pressure in the equation- - frac -pi pr-4 - -8eta iota - What will be the dimensions of eta

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If the fundamental quantities are velocity (v), I length, r radius and p pressure in the equation.
$$ v = \frac {\pi pr^4 } {8\eta \iota } $$
What will be the dimensions of $$ \eta $$

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If the fundamental quantities are velocity (v), I length, r radius and p pressure in the equation.$$ v = \frac {\pi pr^4 } {8\eta \iota } $$What will be the dimensions of $$ \eta $$

If the fundamental quantities are velocity (v), I length, r radius and p pressure in the equation.
$$ v = \frac {\pi pr^4 } {8\eta \iota } $$
What will be the dimensions of $$ \eta $$