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Two. Take 3 balls and 3 balls. Leave 2 on the table. If the 3 and 3 balance set them aside and weigh the remaining 2 balls and you know which one is heavier. Done. If they don't balance, take the heavier 3, place one ball on the table and balance the other 2. If they balance, the one on the table is heavier. Done. If they don't, you know which one of the two is heaver. Done.

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Q: What is the minimum no of weighings to detect a heavier ball out of 8 balls?
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