It's about as heavy as a Sesame Seed.
It's about four-fifths as heavy as a Grain of Sand.
In other words, 3.640 miligrams is 0.830 times the weight of a Grain of Sand, and the weight of a Grain of Sand is 1.20 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 six times as heavy as a Grain of Sugar.
In other words, 3.640 miligrams is 5.820 times the weight of a Grain of Sugar, and the weight of a Grain of Sugar is 0.1720 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 one-tenth as heavy as a Grain of Rice.
In other words, 3.640 miligrams is 0.130 times the weight of a Grain of Rice, and the weight of a Grain of Rice is 7.70 times that amount.(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 twelve times as heavy as a Poppy Seed.
In other words, the weight of a Poppy Seed is 0.083 times 3.640 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 one-fiftieth as heavy as a Raindrop.
In other words, the weight of a Raindrop is 50 times 3.640 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.
It's about 60 times as heavy as a Grain of Salt.
In other words, 3.640 miligrams is 62.20 times the weight of a Grain of Salt, and the weight of a Grain of Salt is 0.0161 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.