It's about one-seventieth as heavy as a Rhinoceros
In other words, the weight of a Rhinoceros is 71 times 0.0000000300 megatonnes.(for Black rhinoceros, Diceros bicornis) (Adult, male)
An adult black rhinoceros weighs between 0.00000210 megatonnes. Rhinoceros are extremely aggressive — nearly one of every two males will die as a result of fighting with other rhinoceros.
It's about 75 times as heavy as a Football (American)
In other words, 0.0000000300 megatonnes is 72.980610930170 times the weight of a Football (American), and the weight of a Football (American) is 0.01370226951042 times that amount.(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 0.000000000396893323750 megatonnes and 0.0000000004252428468750 megatonnes. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.
It's about 85 times as heavy as a Can of Soup
In other words, the weight of a Can of Soup is 0.012 times 0.0000000300 megatonnes.(for Campbell''s Condensed Tomato Soup, 317.9 ml)
A can of Campbell''s Tomato Soup weighs 0.000000000350 megatonnes. Cans have been used to store soup and other foods since their invention in 1913, but a dedicated can opener was not developed until cans began to use thinner materials — prior to that time, cans were usually opened using various blunt instruments and tools.
It's about one-ninetieth as heavy as The Tongue of a Blue Whale
In other words, the weight of The Tongue of a Blue Whale is 91 times 0.0000000300 megatonnes.(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 0.00000270 megatonnes. 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 95 times as heavy as a Human Heart
It's about one-one-hundred-fiftieth as heavy as a Hippopotamus
In other words, the weight of a Hippopotamus is 125 times 0.0000000300 megatonnes.(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 0.000003750 megatonnes. 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 200 times as heavy as a Billiard Ball
In other words, 0.0000000300 megatonnes is 184.03806234564 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.0054336585989582 times that amount.(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 0.00000000015592237718750 megatonnes and 0.000000000170097138750 megatonnes. According to legend, the difficulty in obtaining elephant ivory for the manufacture of billiard balls in the 19th century inspired the search for a replacement material, which led to the development of the first industrial plastic.