Huh, I've never considered estimating the weight of my hands, but after reading I can see the importance/application.
this post was submitted on 28 Jul 2023
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Generally you get a good estimate by assuming a body part is just water, and then look at its volume. My fist here is about 400 mL and the other comment said the average is 400 grams. Now I'll look at my whole arm... 3L? I found a source that says one is about 5% your body weight, so 70 kg • 0.05 = 3.5 kg. Pretty good!