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How heavy is 190 grains?

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It's about as heavy as a Battery (AAA).
(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 four-fifths as heavy as a Compact disc.
In other words, 190 grains is 0.820 times the weight of a Compact disc, and the weight of a Compact disc is 1.20 times that amount.
(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 three-fifths as heavy as a Mouse.
In other words, 190 grains is 0.590 times the weight of a Mouse, and the weight of a Mouse is 1.70 times that amount.
(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-and-seven-tenths times as heavy as an Eye (Human).
In other words, the weight of an Eye (Human) is 0.590 times 190 grains.
(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.
It's about half as heavy as a Battery (AA).
In other words, 190 grains is 0.510 times the weight of a Battery (AA), and the weight of a Battery (AA) is 2 times that amount.
(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 two times as heavy as a sheet of Paper.
In other words, the weight of a sheet of Paper is 0.50 times 190 grains.
(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 100,000 grains, 8.5 inch x 11 inch paper is 30,000 grains, each sheet weighing 80 grains. Paper of this size has a thickness of 0.004 caliper (0.1 mm).
It's about two times as heavy as a Quarter.
In other words, 190 grains is 2.1710 times the weight of a Quarter, and the weight of a Quarter is 0.46060 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 87.50 grains each. In answer to the common riddle, there are 119 ridges around the edge of the coin in its current design.