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How heavy is 315 miligrams?

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It's about 5,500 times as heavy as a Grain of Salt
In other words, 315 miligrams is 5,380 times the weight of a Grain of Salt, and the weight of a Grain of Salt is 0.00019 times that amount.
The mass of a grain of salt is approximately 0.0585 mgs. Salt consumption varies widely by country; the people of the United States consume a combined total of about 57,000,000,000,000 miligrams of salt each year.
It's about 1,000 times as heavy as a Poppy Seed
In other words, 315 miligrams is 1,100 times the weight of a Poppy Seed, and the weight of a Poppy Seed is 0.0009 times that amount.
(Papaver somniferum)
Fifty percent oil by weight, a poppy seed weighs approximately 0.3 mg. The true pigment of a poppy seed is brown in color, while the characteristic bluish color is an optical illusion caused by a layer of calcium oxalate crystals refracting light rays.
It's about 500 times as heavy as a Grain of Sugar
In other words, 315 miligrams is 504 times the weight of a Grain of Sugar, and the weight of a Grain of Sugar is 0.0020 times that amount.
(a.k.a. white sugar, a.k.a. white refined sugar, a.k.a. table sugar, a.k.a. sucrose, a.k.a. saccharose)
A grain of sugar weighs approximately 0.625 mg. Sugar consumption varies widely by country; the average citizen of the United States consumes about 61,200,000 miligrams of sugar each year.
It's about 85 times as heavy as a Sesame Seed
In other words, 315 miligrams is 86.5 times the weight of a Sesame Seed, and the weight of a Sesame Seed is 0.012 times that amount.
(Sesamum indicum)
A sesame seed weighs approximately 3.64 mg. The McDonald's Big Mac sandwich, which is well-known for its sesame seed top bun, accounts for the consumption of an estimated 2,010,000,000 miligrams of sesame seeds each day.
It's about 70 times as heavy as a Grain of Sand
In other words, 315 miligrams is 72 times the weight of a Grain of Sand, and the weight of a Grain of Sand is 0.01 times that amount.
(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 4.4 mg. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.
It's about fifteen times as heavy as a Grain of Rice
In other words, 315 miligrams is 15 times the weight of a Grain of Rice, and the weight of a Grain of Rice is 0.07 times that amount.
(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.
It's about two times as heavy as a Raindrop
In other words, 315 miligrams is 2 times the weight of a Raindrop, and the weight of a Raindrop is 0.5 times that amount.
(a.k.a. drop, a.k.a. droplet) (average)
The weight of a raindrop depends heavily on the type of weather, but averages about 200 mg. The familiar teardrop shape of a raindrop is actually an optical illusion, caused by the reflection of the light and the motion of the drop.