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How heavy is 31,000,000 grains?

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It's about 85,000 times as heavy as a Battery (AA)
In other words, the weight of a Battery (AA) is 0.0000120 times 31,000,000 grains.
(Alkaline)
An "AA" size battery weighs 370 grains. AA batteries came into common use during World War II and were given their name by the American National Standards Institute (ANSI) Committee C18 because they were smaller than the "A" size batteries which were invented first.
It's about 95,000 times as heavy as a Mouse
In other words, the weight of a Mouse is 0.00001000 times 31,000,000 grains.
(a.k.a. "House mouse", Mus musculus) (adult)
The weight of a mouse is typically an average of 320 grains. While most mice typically live two to three years, the Methuselah Mouse Prize — an award administered by a non-profit organization which advances aging-related research — was once awarded to a team of scientists whose research resulted in a mouse living just under five years.
It's about one-one-hundred-thousandth as heavy as The Sears Tower
In other words, 31,000,000 grains is 0.0000099540 times the weight of The Sears Tower, and the weight of The Sears Tower is 100,500 times that amount.
(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 3,114,000,000,000 grains. The outer wall surface of the Tower is covered with black anodized aluminum panels which would total 110,000 sq. m (28 acres) if laid out together.
It's about 150,000 times as heavy as a Compact disc
In other words, the weight of a Compact disc is 0.00000770 times 31,000,000 grains.
(a.k.a. CD)
A compact disc typically weighs 230 grains. 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 one-one-hundred-fifty-thousandth as heavy as The Empire State Building
In other words, 31,000,000 grains is 0.000006070 times the weight of The Empire State Building, and the weight of The Empire State Building is 165,000 times that amount.
(New York City, New York)
The Empire State Building weighs approximately 5,110,000,000,000 grains. About 4% of the building's weight is its 6,000 cu. m (200,000 cu. ft) of limestone façade.
It's about 150,000 times as heavy as a Battery (AAA)
In other words, the weight of a Battery (AAA) is 0.00000590 times 31,000,000 grains.
(Alkaline)
An "AAA" size battery weighs 190 grains. 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 300,000 times as heavy as an Eye (Human)
In other words, 31,000,000 grains is 280,000 times the weight of an Eye (Human), and the weight of an Eye (Human) is 0.00000360 times that amount.
(adult)
A fully developed eye (in a person over the age of thirteen), weighs about 110 grains. The pupil of the eye varies depending on the amount of light it is exposed to, but typically measures about 4 mm across.