It's about as heavy as a Grain of Rice
(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 0.0000210 kilograms 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 five times as heavy as a Grain of Sand
In other words, 0.0000210 kilograms is 4.80 times the weight of a Grain of Sand, and the weight of a Grain of Sand is 0.210 times that amount.(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.00000440 kilograms. 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 Sesame Seed
In other words, 0.0000210 kilograms is 5.770 times the weight of a Sesame Seed, and the weight of a Sesame Seed is 0.1730 times that amount.(Sesamum indicum)
A sesame seed weighs approximately 0.000003640 kilograms. The McDonald's Big Mac sandwich, which is well-known for its sesame seed top bun, accounts for the consumption of an estimated 2,009.32 kg of sesame seeds each day.
It's about one-tenth as heavy as a Raindrop
In other words, the weight of a Raindrop is 10 times 0.0000210 kilograms.(a.k.a. drop, a.k.a. droplet) (average)
The weight of a raindrop depends heavily on the type of weather, but averages about 0.0002 kilograms. 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 thirty times as heavy as a Grain of Sugar
In other words, 0.0000210 kilograms is 33.60 times the weight of a Grain of Sugar, and the weight of a Grain of Sugar is 0.0298 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 0.0000006250 kilograms. Sugar consumption varies widely by country; the average citizen of the United States consumes about 61.2 kg of sugar each year.
It's about one-thirty-fifth as heavy as a Nail
It's about one-fifty-fifth as heavy as a Jelly Bean
In other words, the weight of a Jelly Bean is 53 times 0.0000210 kilograms.(for Jelly Belly beans; approximate)
Made of sugar, corn syrup, and pectin, a single jelly bean weighs about 0.0011 kilograms. President Ronald Reagan cited jelly beans as his favorite candy and 3,200 kilograms of the candies were served at his first inauguration in 1981.