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How heavy is 645.5 miligrams?

It's about one-tenth as heavy as an Eye (Human)
The weight of an Eye (Human) is about 7,100 miligrams.
(adult)
A fully developed eye (in a person over the age of thirteen), weighs about 7,100 miligrams. 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 one-twentieth as heavy as a Battery (AAA)
The weight of a Battery (AAA) is about 12,000 miligrams.
(Alkaline)
An "AAA" size battery weighs 12,000 miligrams. 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-twenty-fifth as heavy as a Compact disc
The weight of a Compact disc is about 15,000 miligrams.
(a.k.a. CD)
A compact disc typically weighs 15,000 miligrams. 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-thirtieth as heavy as a Mouse
The weight of a Mouse is about 21,000 miligrams.
(a.k.a. "House mouse", Mus musculus) (adult)
The weight of a mouse is typically an average of 21,000 miligrams. 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-thirty-fifth as heavy as a Battery (AA)
The weight of a Battery (AA) is about 24,000 miligrams.
(Alkaline)
An "AA" size battery weighs 24,000 miligrams. 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 one-fifty-fifth as heavy as a Light Bulb
The weight of a Light Bulb is about 34,000 miligrams.
(a.k.a. lamp) (for A19-size, 60w, incandescent bulb by Bulbrite; package weight)
A standard, sixty-watt light bulb weighs about 34,000 miligrams. The tightly-coiled filament inside a bulb of this size would measure about 579mm if uncoiled and stretched out.
It's about one-seventieth as heavy as a Golf Ball
The weight of a Golf Ball is about 45,930 miligrams.
(per R&A USGA Rules of Golf; maximum rule weight)
According to the Rules of Golf (as approved by the United States Golf Association and the Rules Committee of the Royal and Ancient Golf Club of Saint Andrews), golf balls must weigh no more than 45,930 miligrams. Golf balls are not required to have the familiar dimpled pattern, but the design has been popular since its invention in 1905 because it reduces drag while increasing lift.
It's about one-ninetieth as heavy as a Tennis Ball
The weight of a Tennis Ball is about 57,700 miligrams.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 57,700 miligrams. Competition balls are also tested for bounce height, with the standards requiring that a ball dropped from 254 cm must bounce back to a height of 135 cm to 147 cm.
It's about one-one-hundredth as heavy as a Battery (C)
The weight of a Battery (C) is about 65,000 miligrams.
(Alkaline)
A "C" size battery weighs 65,000 miligrams. C batteries are typically used in medium-drain devices such as musical instruments.
It's about one-one-hundred-fiftieth as heavy as a Deck of Cards
The weight of a Deck of Cards is about 94,000 miligrams.
(ISO 216 B8 size, a.k.a. "poker size" 63 x 88 mm, 52-card deck)
A deck of 52 ISO 216 B8-size playing cards weighs 94,000 miligrams. Utilizing nearly 3,700 decks, the record-holding largest card tower was built in early 2010, stood over 3.5 m (11 ft), and weighed over 230,000,000 miligrams.
It's about one-two-hundredth as heavy as a Battery (D)
The weight of a Battery (D) is about 135,000 miligrams.
(Alkaline)
A "D" size battery weighs 135,000 miligrams. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
It's about one-two-hundred-fiftieth as heavy as a Baseball
The weight of a Baseball is about 145,291.306015630 miligrams.
(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 141,747.6156250 miligrams and 148,834.996406250 miligrams. A major league pitcher can throw a baseball at up to 150 kph (91 mph) (with a fastball pitch), with record-setting pitches as fast as 171 kph (106 mph).
It's about one-two-hundred-fiftieth as heavy as a Billiard Ball
The weight of a Billiard Ball is about 163,009.757968750 miligrams.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 155,922.37718750 miligrams and 170,097.138750 miligrams. According to legend, the difficulty in obtaining elephant ivory for the manufacture of billiard balls in the 19th century inspired the search for a replacement material, which led to the development of the first industrial plastic.
It's about one-two-hundred-fiftieth as heavy as a Hockey Puck
The weight of a Hockey Puck is about 163,009.757968750 miligrams.
(Ice hockey)
A standard ice hockey puck weighs between 155,922.37718750 miligrams and 170,097.138750 miligrams. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
It's about one-three-hundred-fiftieth as heavy as a Hamster
The weight of a Hamster is about 200,000 miligrams.
(for Syrian hamster, a.k.a. golden hamster, a.k.a. Mesocricetus auratus; adult)
An adult Syrian hamster has a typical weight of about 200,000 miligrams. Known for transporting food in the pouches of their cheeks so that they can bury it later, some hamsters can store up to 30,000,000 miligrams of food in their borrows.
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