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How heavy is 400,000,000 tonnes?

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It's about 25,000,000,000,000 times as heavy as a Compact disc.
In other words, the weight of a Compact disc is 0.0000000000000370 times 400,000,000 tonnes.
(a.k.a. CD)
A compact disc typically weighs 0.0000150 tonnes. Data is stored on CDs by encoding into the track a series of tiny pits — each between 3.5 and 850 µm (0.00014 and 0.033 in) in length.
It's about 35,000,000,000,000 times as heavy as a Battery (AAA).
In other words, the weight of a Battery (AAA) is 0.0000000000000300 times 400,000,000 tonnes.
(Alkaline)
An "AAA" size battery weighs 0.0000120 tonnes. Batteries are named by the American National Standards Institute (ANSI) Committee C18 and AAA batteries were given their name because they were smaller than the "AA" and "A" size batteries which were invented first.
It's about 55,000,000,000,000 times as heavy as an Eye (Human).
In other words, the weight of an Eye (Human) is 0.0000000000000180 times 400,000,000 tonnes.
(adult)
A fully developed eye (in a person over the age of thirteen), weighs about 0.00000710 tonnes. The pupil of the eye varies depending on the amount of light it is exposed to, but typically measures about 4 mm across.
It's about 70,000,000,000,000 times as heavy as a Quarter.
In other words, 400,000,000 tonnes is 70,550,000,000,000 times the weight of a Quarter, and the weight of a Quarter is 0.000000000000014170 times that amount.
(United States quarter-dollar coin) (a.k.a. Quarter dollar, a.k.a. America the Beautiful quarter, a.k.a. two bits)
The America the Beautiful series quarters, which began to enter circulation in 2017, weigh 0.000005670 tonnes each. In answer to the common riddle, there are 119 ridges around the edge of the coin in its current design.
It's about 80,000,000,000,000 times as heavy as a sheet of Paper.
In other words, the weight of a sheet of Paper is 0.00000000000001000 times 400,000,000 tonnes.
(for US Letter, a.k.a. ANSI A; 215.9mm by 279.4mm (8.5 in x 11 in); 20lb)
The weight of a ream (500 sheets) of 0.009 tonnes, 8.5 inch x 11 inch paper is 0.002 tonnes, each sheet weighing 0.00000500 tonnes. Paper of this size has a thickness of 0.004 caliper (0.1 mm).
It's about 100,000,000,000,000 times as heavy as a Die (Dice).
In other words, 400,000,000 tonnes is 98,000,000,000,000 times the weight of a Die (Dice), and the weight of a Die (Dice) is 0.00000000000001000 times that amount.
(for six-sided, 16 mm, rounded cube)
A die, of the size most commonly used in board games and casinos, typically weight 0.00000410 tonnes. The use of dice and dice-like tools predates written history, with the oldest known examples belonging to a 5,000-year old backgammon set uncovered during an archaeological dig in modern-day Iran.
It's about 150,000,000,000,000 times as heavy as a Penny.
In other words, the weight of a Penny is 0.00000000000000630 times 400,000,000 tonnes.
(United States) (formally one-cent coin) (Union shield design, 2010-present)
The weight of a United States penny is 0.00000250 tonnes. According to a 2010 report by the United States Mint, the cost of manufacturing and distributing a penny is $0.0179 — more than its face-value.