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How heavy is 39 grains?

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It's about one-third as heavy as an Eye (Human).
In other words, the weight of an Eye (Human) is 2.80 times 39 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 three times as heavy as a Nail.
In other words, 39 grains is 3.20 times the weight of a Nail, and the weight of a Nail is 0.310 times that amount.
(for 15-gauge, 2-inch, finishing nails)
A two-inch finishing nail weighs 12 grains. Nails have been in use for more than 5,400 years and were ven used as a medium of exchange in ancient times.
It's about one-fifth as heavy as a Battery (AAA).
In other words, 39 grains is 0.210 times the weight of a Battery (AAA), and the weight of a Battery (AAA) is 4.80 times that amount.
(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 one-fifth as heavy as a Compact disc.
In other words, 39 grains is 0.170 times the weight of a Compact disc, and the weight of a Compact disc is 5.90 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 one-tenth as heavy as a Mouse.
In other words, 39 grains is 0.120 times the weight of a Mouse, and the weight of a Mouse is 8.30 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-tenth as heavy as a Battery (AA).
In other words, 39 grains is 0.110 times the weight of a Battery (AA), and the weight of a Battery (AA) is 9.10 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 ten times as heavy as a Raindrop.
In other words, the weight of a Raindrop is 0.10 times 39 grains.
(a.k.a. drop, a.k.a. droplet) (average)
The weight of a raindrop depends heavily on the type of weather, but averages about 3 grains. 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.