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How heavy is 491 miligrams?

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It's about 8,500 times as heavy as a Grain of Salt.
In other words, 491 miligrams is 8,390 times the weight of a Grain of Salt, and the weight of a Grain of Salt is 0.000119 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 2,730,000,000,000 miligrams of salt each year.
It's about 1,500 times as heavy as a Poppy Seed.
In other words, the weight of a Poppy Seed is 0.00063 times 491 miligrams.
(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 800 times as heavy as a Grain of Sugar.
In other words, 491 miligrams is 786 times the weight of a Grain of Sugar, and the weight of a Grain of Sugar is 0.00127 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 150 times as heavy as a Sesame Seed.
In other words, 491 miligrams is 135 times the weight of a Sesame Seed, and the weight of a Sesame Seed is 0.00741 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 100 times as heavy as a Grain of Sand.
In other words, 491 miligrams is 110 times the weight of a Grain of Sand, and the weight of a Grain of Sand is 0.0091 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 seventeen times as heavy as a Grain of Rice.
In other words, the weight of a Grain of Rice is 0.059 times 491 miligrams.
(long grain; 14% moisture content)
A single long grain of rice weighs an average of 29 mg. 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, the weight of a Raindrop is 0.5 times 491 miligrams.
(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.