Pick the light sack

You have been given \( n \) sacks with grains having weight of \( 10 grams \) in each sack except one sack in which grains have weight of \( 9 grams \). You have been given a weighing machine for use. In how many minimum number of usage of that weighing machine can you identify the sack.

Note: In each sack there are infinite number of grains

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