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Is 315 miligrams as heavy as a Grain of Rice?

It's about fifteen times as heavy as a Grain of Rice
The weight of a Grain of Rice is about 21 miligrams.
(conventional; US; long-, medium-, and short-gran varieties; uncooked)
With great differences in variety, the average among a sampling of common short-, medium- and long-grain rices finds that a single grain weighs about 21 mg before cooking. A staple through most of human history, archaeological evidence indicates that the earliest rice cultivation was about 11,500 years ago.
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