It's about one-sixty-fifth as heavy as a Billiard Ball
In other words, 0.00000000000250 megatonnes is 0.01533650519547 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 65.2039031874990 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.
It's about one-sixty-fifth as heavy as a Puck (Hockey)
In other words, 0.00000000000250 megatonnes is 0.01533650519547 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 65.2039031874990 times that amount.(Ice hockey)
A standard ice hockey puck weighs between 0.00000000015592237718750 megatonnes and 0.000000000170097138750 megatonnes. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
It's about one-one-hundredth as heavy as a Hamster
In other words, the weight of a Hamster is 100 times 0.00000000000250 megatonnes.(for Syrian hamster, a.k.a. golden hamster, a.k.a. Mesocricetus auratus; adult)
An adult Syrian hamster has a typical weight of about 0.000000000200 megatonnes. Known for transporting food in the pouches of their cheeks so that they can bury it later, some hamsters can store up to 0.0000000300 megatonnes of food in their borrows.
It's about 100 times as heavy as a Grain of Rice
In other words, 0.00000000000250 megatonnes is 120 times the weight of a Grain of Rice, and the weight of a Grain of Rice is 0.0083 times that amount.(conventional; US; long-, medium-, and short-gran varieties; uncooked)
With great differences in variety, the average among a sampling of common short-, medium- and long-grain rices finds that a single grain weighs about 0.0000000000000210 megatonnes before cooking. 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-one-hundredth as heavy as a Human Heart
In other words, 0.00000000000250 megatonnes is 0.0081 times the weight of a Human Heart, and the weight of a Human Heart is 120 times that amount.(human; adult)
The average human heart weighs about 0.000000000310 megatonnes. Each minute, the heart pumps between 10 and 20 liters (3 to 5 gallons) of blood through its chambers.
It's about one-one-hundred-fiftieth as heavy as a Can of Soup
In other words, the weight of a Can of Soup is 140 times 0.00000000000250 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-one-hundred-fiftieth as heavy as a Football (American)
In other words, 0.00000000000250 megatonnes is 0.006081717577514 times the weight of a Football (American), and the weight of a Football (American) is 164.4272341250 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.