eli5 why are fighters (boxing, mma etc.) still weighed with old balance scales rather than digital?
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From a physics point of view, balance scales are are more accurate way to make a measurement that consistently stays the same because it depends on MASS rather than WEIGHT.
No matter what variation there may be in local gravity (say by being at higher altitude), it gets canceled out because you are comparing the counterweights to your weight. By putting weight on both ends of the lever and comparing them to each other, whatever the gravity variation my be in your location it applies to both sides of the lever and thus cancels out. As long as your MASS times the lever distance matches the other side’s MASS times its lever distance, the balance will be centered no matter what the gravity is like where you are.
From a physics point of view, balance scales are are more accurate way to make a measurement that consistently stays the same because it depends on MASS rather than WEIGHT.
No matter what variation there may be in local gravity (say by being at higher altitude), it gets canceled out because you are comparing the counterweights to your weight. By putting weight on both ends of the lever and comparing them to each other, whatever the gravity variation my be in your location it applies to both sides of the lever and thus cancels out. As long as your MASS times the lever distance matches the other side’s MASS times its lever distance, the balance will be centered no matter what the gravity is like where you are.
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