A grain of rice weighs roughly 0.0725 ounces.
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Depends how big the grain of salt is.
That's an impossible question to answer, as each one of the 1 million grains of sand will all be a different size and density, making each one of them weigh a different amount. Because of this, no 1 million grains of sand will weigh the same amount.
you can always filter out all the extra salt from the water and weigh it with normal water with nothing on it and see how much the salt water weigh by the normal water
A grain of salt is typically measured in milligrams (mg) or micrograms (mcg). One grain of salt is equivalent to approximately 58 milligrams.
Unknown. Mercury is too dangerous to test.