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How heavy is 300,000,000 grains?

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It's about one-and-seven-tenths times as heavy as an Anchor of a Cruise Ship.
In other words, 300,000,000 grains is 1.720 times the weight of an Anchor of a Cruise Ship, and the weight of an Anchor of a Cruise Ship is 0.5810 times that amount.
(for QE2 forward anchor, a.k.a. RMS Queen Elizabeth 2)
Each of the forward anchors of the RMS Queen Elizabeth 2 weighs 174,000,000 grains. The anchor of the QE2 now sits in front of the Holyrood Church in Southampton, England, United Kingdom, along a pedestrian tourist route known as "the QE2 mile."
It's about three times as heavy as a Tyrannosaurus rex.
In other words, the weight of a Tyrannosaurus rex is 0.330 times 300,000,000 grains.
(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)
The notable Tyrannosaurus specimen housed at the Field Museum of Natural History in Chicago, Illinois, "Sue," is estimated to have weighed about 99,000,000 grains while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.
It's about three times as heavy as an Elephant.
In other words, 300,000,000 grains is 3.20 times the weight of an Elephant, and the weight of an Elephant is 0.310 times that amount.
(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 94,000,000 grains. Among African elephants, both males and females have tusks (whereas female Asian elephants, Elephas maximus, do not have tusks) which can grow to 3 m (10 ft) and typically weigh about 62,000,000 grains
It's about one-fourth as heavy as The Space Shuttle.
In other words, 300,000,000 grains is 0.270 times the weight of The Space Shuttle, and the weight of The Space Shuttle is 3.70 times that amount.
(for Endeavour, a.k.a. OV-105, a.k.a. Orbiter Vehicle-105) (empty weight, excluding main engines)
When empty, the space shuttle Endeavour weighs 1,100,000,000 grains. The shuttle's spacious cargo bay carried the Chandra X-ray Observatory into orbit in 1999 — a payload that weighed 300,000,000 grains.
It's about five times as heavy as a Hippopotamus.
In other words, 300,000,000 grains is 5.180 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 0.1930 times that amount.
(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 57,900,000 grains. Appearances to the contrary, adult hippos cannot swim or float in water; they actually move by leaping and walking across lake bottoms at about 8 kph (5 mph).
It's about one-fifth as heavy as a Blue Whale.
In other words, 300,000,000 grains is 0.1860 times the weight of a Blue Whale, and the weight of a Blue Whale is 5.380 times that amount.
(Balaenoptera musculus)
Blue whales weigh between 1,610,000,000 grains. The largest mammal to have ever lived, blue whales feed almost exclusively on krill — tiny invertebrates weighing about 15.40 grains each.
It's about seven times as heavy as The Tongue of a Blue Whale.
In other words, 300,000,000 grains is 7.20 times the weight of The Tongue of a Blue Whale, and the weight of The Tongue of a Blue Whale is 0.140 times that amount.
(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 42,000,000 grains. Despite their tremendous size, blue whales feed almost exclusively on tiny crustaceans called krill and cannot swallow anything much larger than a beach ball.