You don't need a weighing machine, do you?
Which of the following weighs more?
A- A bag containing 1 kg of cotton
B-A block of iron with a weight of 1kg
Note
Assume that you are in an environment where there is no air.
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1 solution
Weight of 1 k g of cotton= weight of 1 k g of iron
But along with the bag, the cotton would weigh more than the block of iron .