Comment from Rob
I’m doing something wrong with my math here. The volume of a grain of salt would be approximately 0.000027 cubic centimeters. A tuna can is about 151 cubic centimeters. That puts about 5.6 million grains in a standard tuna can.
Comment from debrain
You are right. I actually meant grain of sand. A grain of small sand is 20 µm, equating to 0.000000008cm cube which multiplied by 6.9 billion people would equal roughly 55cc which would fit into a can of tuna
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