1. what do u mean by SI unit ?
2. what do u mean by saying that the length of a table is 3m?
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si unit mean standarfd unit which is not only applicable in a single country but it is applicable all over the world.
saying that the length of the table is 3 m is that the longest side of the table is 3 m.
saying that the length of the table is 3 m is that the longest side of the table is 3 m.
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