It's about one-sixty-fifth as heavy as a Billiard Ball.
In other words, 39 grains is 0.015503105590062 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 64.5032051282060 times that amount.(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 2,406.250 grains and 2,625 grains. 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, 39 grains is 0.015503105590062 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 64.5032051282060 times that amount.(Ice hockey)
A standard ice hockey puck weighs between 2,406.250 grains and 2,625 grains. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
It's about 85 times as heavy as a Grain of Rice.
In other words, the weight of a Grain of Rice is 0.011 times 39 grains.(long grain; 14% moisture content)
A single long grain of rice weighs an average of 0.450 grains. 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 Hamster.
In other words, the weight of a Hamster is 100 times 39 grains.(for Syrian hamster, a.k.a. golden hamster, a.k.a. Mesocricetus auratus; adult)
An adult Syrian hamster has a typical weight of about 3,000 grains. Known for transporting food in the pouches of their cheeks so that they can bury it later, some hamsters can store up to 400,000 grains of food in their borrows.
It's about one-one-hundredth as heavy as a Human Heart.
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 39 grains.(for Campbell''s Condensed Tomato Soup, 317.9 ml)
A can of Campbell''s Tomato Soup weighs 5,400 grains. 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, 39 grains is 0.006147783251232 times the weight of a Football (American), and the weight of a Football (American) is 162.66025641020 times that amount.(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 6,125 grains and 6,562.50 grains. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.