In the given 8 balls, 7 balls are equal in weight by the one ball is quite heavier than the rest. How will you figure out which one is heavier with the help of a balance?

Out of all the balls take 6 balls separately; now place 3 balls on each side of the balance. If they weigh equal then you will know that the heavier ball is in the remaining 2 (if they don't weigh equal then the heavier is among the 6 balls).