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How heavy is 315 miligrams?

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It's about 0.00000009 times as heavy as a Hippopotamus
In other words, 315 miligrams is 0.000000083 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 12,000,000 times that amount.
(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 3,800,000,000 miligrams. 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 0.00000005 times as heavy as an Elephant
In other words, 315 miligrams is 0.000000052 times the weight of an Elephant, and the weight of an Elephant is 19,000,000 times that amount.
(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 6,100,000,000 miligrams. 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 4,000,000,000 miligrams
It's about 0.00000004 times as heavy as a Tyrannosaurus rex
In other words, 315 miligrams is 0.0000000358 times the weight of a Tyrannosaurus rex, and the weight of a Tyrannosaurus rex is 27,900,000 times that amount.
(for FMNH PR 2081, 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 8,800,000,000 miligrams 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 0.00000003 times as heavy as an Anchor of a Cruise Ship
In other words, 315 miligrams is 0.0000000279 times the weight of an Anchor of a Cruise Ship, and the weight of an Anchor of a Cruise Ship is 35,800,000 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 11,300,000,000 miligrams. 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 0.000000005 times as heavy as The Space Shuttle
In other words, 315 miligrams is 0.0000000044 times the weight of The Space Shuttle, and the weight of The Space Shuttle is 230,000,000 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 71,000,000,000 miligrams. The shuttle's spacious cargo bay carried the Chandra X-ray Observatory into orbit in 1999 — a payload that weighed 20,000,000,000 miligrams.
It's about 0.000000003 times as heavy as a Blue Whale
In other words, 315 miligrams is 0.00000000301 times the weight of a Blue Whale, and the weight of a Blue Whale is 332,000,000 times that amount.
(Balaenoptera musculus)
Blue whales weigh between 105,000,000,000 miligrams. The largest mammal to have ever lived, blue whales feed almost exclusively on krill — tiny invertebrates weighing about 1,000 miligrams each.
It's about 0.000000003 times as heavy as The Statue of Liberty (without base)
In other words, 315 miligrams is 0.0000000023 times the weight of The Statue of Liberty (without base), and the weight of The Statue of Liberty (without base) is 430,000,000 times that amount.
(a.k.a. Liberty Enlightening the World, a.k.a. La Liberté éclairant le monde) (total weight, including foundation)
The total weight of the Statue of Liberty — the Statue's copper and framework only, excluding the base — is roughly 140,000,000,000 miligrams. The statue was designed using an optical trick known as "forced perspective" to make the statue appear proportionally correct when viewed from its base and is, in actuality, disproportionately large at the top.