It's about as heavy as a Grain of Sugar.
It's about two times as heavy as a Poppy Seed.
In other words, 0.000625 grams is 2.10 times the weight of a Poppy Seed, and the weight of a Poppy Seed is 0.480 times that amount.(Papaver somniferum)
Fifty percent oil by weight, a poppy seed weighs approximately 0.0003 grams. 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-fifth as heavy as a Sesame Seed.
In other words, 0.000625 grams is 0.1720 times the weight of a Sesame Seed, and the weight of a Sesame Seed is 5.810 times that amount.(Sesamum indicum)
A sesame seed weighs approximately 0.00364 grams. 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 grams of sesame seeds each day.
It's about one-tenth as heavy as a Grain of Sand.
In other words, 0.000625 grams is 0.140 times the weight of a Grain of Sand, and the weight of a Grain of Sand is 7.10 times that amount.(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.0044 grams. 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 ten-and-a-half times as heavy as a Grain of Salt.
It's about one-forty-fifth as heavy as a Grain of Rice.
In other words, the weight of a Grain of Rice is 45 times 0.000625 grams.(long grain; 14% moisture content)
A single long grain of rice weighs an average of 0.029 grams. A staple through most of human history, archaeological evidence indicates that the earliest rice cultivation was about 11,500 years ago.
It's about one-three-hundred-fiftieth as heavy as a Raindrop.
In other words, the weight of a Raindrop is 300 times 0.000625 grams.(a.k.a. drop, a.k.a. droplet) (average)
The weight of a raindrop depends heavily on the type of weather, but averages about 0.20 grams. 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.