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How heavy is 688 tonnes?

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It's about 10,000,000,000,000 times as heavy as a Grain of Salt.
In other words, 688 tonnes is 11,800,000,000,000 times the weight of a Grain of Salt, and the weight of a Grain of Salt is 0.00000000000008470 times that amount.
The mass of a grain of salt is approximately 0.00000000005850 tonnes. Salt consumption varies widely by country; the people of the United States consume a combined total of about 2,728.90 tonnes of salt each year.
It's about 2,500,000,000,000 times as heavy as a Poppy Seed.
In other words, the weight of a Poppy Seed is 0.000000000000430 times 688 tonnes.
(Papaver somniferum)
Fifty percent oil by weight, a poppy seed weighs approximately 0.000000000300 tonnes. 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 1,000,000,000,000 times as heavy as a Grain of Sugar.
In other words, 688 tonnes is 1,100,000,000,000 times the weight of a Grain of Sugar, and the weight of a Grain of Sugar is 0.0000000000009090 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 0.0000000006250 tonnes. Sugar consumption varies widely by country; the average citizen of the United States consumes about 0.0612 tonnes of sugar each year.
It's about 200,000,000,000 times as heavy as a Sesame Seed.
In other words, 688 tonnes is 189,000,000,000 times the weight of a Sesame Seed, and the weight of a Sesame Seed is 0.000000000005290 times that amount.
(Sesamum indicum)
A sesame seed weighs approximately 0.000000003640 tonnes. The McDonald's Big Mac sandwich, which is well-known for its sesame seed top bun, accounts for the consumption of an estimated 2.01 tonnes of sesame seeds each day.
It's about 150,000,000,000 times as heavy as a Grain of Sand.
In other words, the weight of a Grain of Sand is 0.00000000000630 times 688 tonnes.
(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.00000000440 tonnes. 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 25,000,000,000 times as heavy as a Grain of Rice.
In other words, the weight of a Grain of Rice is 0.0000000000420 times 688 tonnes.
(long grain; 14% moisture content)
A single long grain of rice weighs an average of 0.0000000290 tonnes. A staple through most of human history, archaeological evidence indicates that the earliest rice cultivation was about 11,500 years ago.
It's about 3,000,000,000 times as heavy as a Raindrop.
In other words, the weight of a Raindrop is 0.000000000300 times 688 tonnes.
(a.k.a. drop, a.k.a. droplet) (average)
The weight of a raindrop depends heavily on the type of weather, but averages about 0.000000200 tonnes. 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.