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How heavy is 29,800,000 grains?

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It's about 15,000 times as heavy as a Battery (D).
In other words, 29,800,000 grains is 14,300 times the weight of a Battery (D), and the weight of a Battery (D) is 0.00006990 times that amount.
(Alkaline)
A "D" size battery weighs 2,080 grains. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
It's about 20,000 times as heavy as a Deck of Cards.
In other words, 29,800,000 grains is 21,000 times the weight of a Deck of Cards, and the weight of a Deck of Cards is 0.0000480 times that amount.
(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 1,500 grains. 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 3,500,000 grains.
It's about 30,000 times as heavy as a Battery (C).
In other words, the weight of a Battery (C) is 0.0000330 times 29,800,000 grains.
(Alkaline)
A "C" size battery weighs 1,000 grains. C batteries are typically used in medium-drain devices such as musical instruments.
It's about 35,000 times as heavy as a Tennis Ball.
In other words, 29,800,000 grains is 33,500 times the weight of a Tennis Ball, and the weight of a Tennis Ball is 0.00002990 times that amount.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 890 grains. 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 40,000 times as heavy as a Golf Ball.
In other words, 29,800,000 grains is 42,040 times the weight of a Golf Ball, and the weight of a Golf Ball is 0.000023790 times that amount.
(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 708.80 grains. 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 55,000 times as heavy as a Light Bulb.
In other words, the weight of a Light Bulb is 0.0000180 times 29,800,000 grains.
(a.k.a. lamp) (for A19-size, 60w, incandescent bulb by Bulbrite; package weight)
A standard, sixty-watt light bulb weighs about 530 grains. The tightly-coiled filament inside a bulb of this size would measure about 579mm if uncoiled and stretched out.
It's about one-sixty-thousandth as heavy as The CN Tower.
In other words, 29,800,000 grains is 0.0000163770 times the weight of The CN Tower, and the weight of The CN Tower is 61,061 times that amount.
(a.k.a. La Tour CN, a.k.a. Canadian National Tower, a.k.a. Canada's National Tower) (Toronto, Canada)
The CN Tower weighs approximately 1,819,600,000,000 grains. The Tower is home to the world's highest glass floor — a viewing area that allows visitors to look straight down 342 m (1,120 ft) to the ground below.