It's about one-fifth as heavy as a Car
In other words, 0.000000250 megatonnes is 0.15130 times the weight of a Car, and the weight of a Car is 6.6090 times that amount.(for 2009 Ford Taurus) (curb weight)
A 2009 Ford Taurus weighs 0.0000016520 megatonnes. The first mass-produced car, the Curved Dash Oldsmobile — introduced in 1901 — weighed just 0.0000003860 megatonnes.
It's about one-tenth as heavy as a Giraffe
In other words, 0.000000250 megatonnes is 0.130 times the weight of a Giraffe, and the weight of a Giraffe is 7.690 times that amount.(Giraffa camelopardalis reticulata) (adult, male, maximum of range)
An adult, male giraffe can weigh up to 0.000001930 megatonnes. Reaching 5.5 m (18 ft) in height by adulthood, giraffe calves can grow as much as 3 cm (1 in) per day.
It's about one-tenth as heavy as a Rhinoceros
In other words, 0.000000250 megatonnes is 0.120 times the weight of a Rhinoceros, and the weight of a Rhinoceros is 8.30 times that amount.(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 eight-and-a-half times as heavy as a Dalmatian
In other words, 0.000000250 megatonnes is 8.470 times the weight of a Dalmatian, and the weight of a Dalmatian is 0.1180 times that amount.(a.k.a. Dalmatinac, a.k.a. Carriage Dog, a.k.a. Spotted Coach Dog, a.k.a. Firehouse Dog) (FCI standard; male)
The Fédération Cynologique Internationale (FCI) calls for Dalmatians to weigh between 0.00000002950 megatonnes. The association of the breed with fire departments (and similarly with Budweiser Beer and its team of Clydesdales) stems from their affinity for horses, having been used historically as carriage dogs capable of guiding horse-drawn fire engines to the sites of blazes.
It's about one-tenth as heavy as The Tongue of a Blue Whale
In other words, the weight of The Tongue of a Blue Whale is 11 times 0.000000250 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 one-fifteenth as heavy as a Hippopotamus
In other words, the weight of a Hippopotamus is 15 times 0.000000250 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 twenty times as heavy as a Gold Bar
In other words, 0.000000250 megatonnes is 20.09421661 times the weight of a Gold Bar, and the weight of a Gold Bar is 0.04976556287 times that amount.(London Good Delivery bar)
A "London Good Delivery" gold bar — the variety commonly held by Central Banks — should weigh 0.000000012441390720 megatonnes. The largest gold bar ever produced was minted by Mitsubishi Materials Corporation (a sibling company of the auto manufacturer) in 2005 and weighed 0.000000250 megatonnes.