What was used as a unit of mass in the classical times?
carob seed
a drop of lead
handful of sand
swallow's egg
Carat, a unit of mass equal to 200 mg, is derived from a carob seed (Greek kerátion). People commonly believed that the seeds have unusually low variability in mass. Modern research denied this claim.
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carob seed
a drop of lead
handful of sand
swallow's egg
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