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How heavy is 0.000021 tonnes?

It's about as heavy as a Mouse
The weight of a Mouse is about 0.0000210 tonnes.
(a.k.a. "House mouse", Mus musculus) (adult)
The weight of a mouse is typically an average of 0.0000210 tonnes. 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 nine-tenths as heavy as a Battery (AA)
The weight of a Battery (AA) is about 0.0000240 tonnes.
(Alkaline)
An "AA" size battery weighs 0.0000240 tonnes. 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-and-two-fifths times as heavy as a Compact disc
The weight of a Compact disc is about 0.0000150 tonnes.
(a.k.a. CD)
A compact disc typically weighs 0.0000150 tonnes. 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 Light Bulb
The weight of a Light Bulb is about 0.0000340 tonnes.
(a.k.a. lamp) (for A19-size, 60w, incandescent bulb by Bulbrite; package weight)
A standard, sixty-watt light bulb weighs about 0.0000340 tonnes. The tightly-coiled filament inside a bulb of this size would measure about 579mm if uncoiled and stretched out.
It's about one-and-four-fifths times as heavy as a Battery (AAA)
The weight of a Battery (AAA) is about 0.0000120 tonnes.
(Alkaline)
An "AAA" size battery weighs 0.0000120 tonnes. 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 half as heavy as a Golf Ball
The weight of a Golf Ball is about 0.000045930 tonnes.
(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 0.000045930 tonnes. 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-third as heavy as a Tennis Ball
The weight of a Tennis Ball is about 0.00005770 tonnes.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 0.00005770 tonnes. 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 three times as heavy as an Eye (Human)
The weight of an Eye (Human) is about 0.00000710 tonnes.
(adult)
A fully developed eye (in a person over the age of thirteen), weighs about 0.00000710 tonnes. 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-third as heavy as a Battery (C)
The weight of a Battery (C) is about 0.0000650 tonnes.
(Alkaline)
A "C" size battery weighs 0.0000650 tonnes. C batteries are typically used in medium-drain devices such as musical instruments.
It's about three-and-a-half times as heavy as a US Quarter
The weight of a US Quarter is about 0.000005670 tonnes.
(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 0.000005670 tonnes each. In answer to the common riddle, there are 119 ridges around the edge of the coin in its current design.
It's about four times as heavy as a sheet of Paper
The weight of a sheet of Paper is about 0.00000500 tonnes.
(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 0.0091 tonnes, 8.5 inch x 11 inch paper is 0.002 tonnes, each sheet weighing 0.00000500 tonnes. Paper of this size has a thickness of 0.004 caliper (0.1 mm).
It's about one-fifth as heavy as a Deck of Cards
The weight of a Deck of Cards is about 0.0000940 tonnes.
(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 0.0000940 tonnes. 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 0.230 tonnes.
It's about five times as heavy as a Die (Dice)
The weight of a Die (Dice) is about 0.00000410 tonnes.
(for six-sided, 16 mm, rounded cube)
A die, of the size most commonly used in board games and casinos, typically weight 0.00000410 tonnes. The use of dice and dice-like tools predates written history, with the oldest known examples belonging to a 5,000-year old backgammon set uncovered during an archaeological dig in modern-day Iran.
It's about one-fifth as heavy as a Battery (D)
The weight of a Battery (D) is about 0.000135 tonnes.
(Alkaline)
A "D" size battery weighs 0.000135 tonnes. 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-tenth as heavy as a Baseball
The weight of a Baseball is about 0.00014529130601563 tonnes.
(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 0.000141747615625 tonnes and 0.00014883499640625 tonnes. 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).
 
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