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How heavy is 641 nanograms?

It's about 0.00000009 times as heavy as an Eye (Human)
The weight of an Eye (Human) is about 7,100,000,000 nanograms.
(adult)
A fully developed eye (in a person over the age of thirteen), weighs about 7,100,000,000 nanograms. 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 0.00000006 times as heavy as a Battery (AAA)
The weight of a Battery (AAA) is about 12,000,000,000 nanograms.
(Alkaline)
An "AAA" size battery weighs 12,000,000,000 nanograms. 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 0.00000005 times as heavy as a Compact disc
The weight of a Compact disc is about 15,000,000,000 nanograms.
(a.k.a. CD)
A compact disc typically weighs 15,000,000,000 nanograms. 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 0.00000003 times as heavy as a Mouse
The weight of a Mouse is about 21,000,000,000 nanograms.
(a.k.a. "House mouse", Mus musculus) (adult)
The weight of a mouse is typically an average of 21,000,000,000 nanograms. 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 0.00000003 times as heavy as a Battery (AA)
The weight of a Battery (AA) is about 24,000,000,000 nanograms.
(Alkaline)
An "AA" size battery weighs 24,000,000,000 nanograms. 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 0.00000002 times as heavy as a Light Bulb
The weight of a Light Bulb is about 34,000,000,000 nanograms.
(a.k.a. lamp) (for A19-size, 60w, incandescent bulb by Bulbrite; package weight)
A standard, sixty-watt light bulb weighs about 34,000,000,000 nanograms. The tightly-coiled filament inside a bulb of this size would measure about 579mm if uncoiled and stretched out.
It's about 0.00000002 times as heavy as a Golf Ball
The weight of a Golf Ball is about 45,930,000,000 nanograms.
(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 45,930,000,000 nanograms. 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 0.00000001 times as heavy as a Tennis Ball
The weight of a Tennis Ball is about 57,700,000,000 nanograms.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 57,700,000,000 nanograms. 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 0.000000010 times as heavy as a Battery (C)
The weight of a Battery (C) is about 65,000,000,000 nanograms.
(Alkaline)
A "C" size battery weighs 65,000,000,000 nanograms. C batteries are typically used in medium-drain devices such as musical instruments.
It's about 0.000000007 times as heavy as a Deck of Cards
The weight of a Deck of Cards is about 94,000,000,000 nanograms.
(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 94,000,000,000 nanograms. 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 230,000,000,000,000.00000000000000000 nanograms.
It's about 0.000000005 times as heavy as a Battery (D)
The weight of a Battery (D) is about 135,000,000,000 nanograms.
(Alkaline)
A "D" size battery weighs 135,000,000,000 nanograms. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
It's about 0.000000005 times as heavy as a Baseball
The weight of a Baseball is about 145,291,306,015.620 nanograms.
(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 141,747,615,625 nanograms and 148,834,996,406.250 nanograms. 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 0.000000004 times as heavy as a Billiard Ball
The weight of a Billiard Ball is about 163,009,757,968.750 nanograms.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 155,922,377,187.50 nanograms and 170,097,138,750 nanograms. 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 0.000000004 times as heavy as a Hockey Puck
The weight of a Hockey Puck is about 163,009,757,968.750 nanograms.
(Ice hockey)
A standard ice hockey puck weighs between 155,922,377,187.50 nanograms and 170,097,138,750 nanograms. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
It's about 0.000000003 times as heavy as a Hamster
The weight of a Hamster is about 200,000,000,000 nanograms.
(for Syrian hamster, a.k.a. golden hamster, a.k.a. Mesocricetus auratus; adult)
An adult Syrian hamster has a typical weight of about 200,000,000,000 nanograms. Known for transporting food in the pouches of their cheeks so that they can bury it later, some hamsters can store up to 30,000,000,000,000 nanograms of food in their borrows.
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