It's about one-nine-thousandth as heavy as The Tongue of a Blue Whale
In other words, 0.310 kilograms is 0.00011 times the weight of The Tongue of a Blue Whale, and the weight of The Tongue of a Blue Whale is 9,100 times that amount.(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 2,700 kilograms. Despite their tremendous size, blue whales feed almost exclusively on tiny crustaceans called krill and cannot swallow anything much larger than a beach ball.
It's about 10,000 times as heavy as a Grain of Rice
In other words, 0.310 kilograms is 11,000 times the weight of a Grain of Rice, and the weight of a Grain of Rice is 0.0000910 times that amount.(long grain; 14% moisture content)
A single long grain of rice weighs an average of 0.0000290 kilograms. A staple through most of human history, archaeological evidence indicates that the earliest rice cultivation was about 11,500 years ago.
It's about one-ten-thousandth as heavy as a Hippopotamus
In other words, 0.310 kilograms is 0.00008270 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 12,100 times that amount.(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 3,000 to 4,500 kg. 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-twenty-thousandth as heavy as an Elephant
In other words, the weight of an Elephant is 20,000 times 0.310 kilograms.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 6,100 kg. 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 kg
It's about one-twenty-thousandth as heavy as a Tyrannosaurus rex
In other words, the weight of a Tyrannosaurus rex is 21,000 times 0.310 kilograms.(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 6,400 kilograms 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 one-thirty-five-thousandth as heavy as an Anchor of a Cruise Ship
In other words, the weight of an Anchor of a Cruise Ship is 36,500 times 0.310 kilograms.(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 kg. 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 70,000 times as heavy as a Grain of Sand
In other words, the weight of a Grain of Sand is 0.0000140 times 0.310 kilograms.(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.00000440 kilograms. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.