It's about one-twentieth as heavy as an Octopus
In other words, the weight of an Octopus is 22 times 0.000000002250 megatonnes.(for Giant Pacific Octopus, Enteroctopus) (Adult, average)
The adult North Pacific Giant Octopus usually weighs around 0.0000000500 megatonnes. It is the largest octopus species and is known for its considerable intelligence, including the ability to open jars, solve mazes, and mimic other octopuses.
It's about twenty times as heavy as a Deck of Cards
In other words, the weight of a Deck of Cards is 0.042 times 0.000000002250 megatonnes.(ISO 216 B8 size, a.k.a. "poker size" 63 x 88 mm, 52-card deck)
A deck of 52 ISO 216 B8-size playing cards weighs 0.0000000000940 megatonnes. Utilizing nearly 3,700 decks, the record-holding largest card tower was built in early 2010, stood over 3.5 m (11 ft), and weighed over 0.000000230 megatonnes.
It's about one-thirtieth as heavy as a Beer Keg
In other words, 0.000000002250 megatonnes is 0.03091 times the weight of a Beer Keg, and the weight of a Beer Keg is 32.350 times that amount.(for US half-barrel, full keg; draft beer; including keg itself, stainless steel)
A typical, half-barrel beer keg weighs 0.00000007280 megatonnes when full. A keg of this size contains 15.5 gallons of beer, or the equivalent of 6.8 cases.
It's about forty times as heavy as a Battery (C)
In other words, the weight of a Battery (C) is 0.029 times 0.000000002250 megatonnes.(Alkaline)
A "C" size battery weighs 0.0000000000650 megatonnes. C batteries are typically used in medium-drain devices such as musical instruments.
It's about one-fortieth as heavy as a Kangaroo
In other words, the weight of a Kangaroo is 38 times 0.000000002250 megatonnes.(for red kangaroo, Macropus rufus) (adult, male)
An adult, male red kangaroo weighs up to 0.0000000850 megatonnes. Fantastic jumpers, red kangaroos can leap horizontally 9 m (30 ft) and vertically 3 m (9 ft) in a single bound.
It's about forty times as heavy as a Tennis Ball
In other words, the weight of a Tennis Ball is 0.0256 times 0.000000002250 megatonnes.(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 0.00000000005770 megatonnes. Competition balls are also tested for bounce height, with the standards requiring that a ball dropped from 254 cm must bounce back to a height of 135 cm to 147 cm.
It's about 50 times as heavy as a Golf Ball
In other words, 0.000000002250 megatonnes is 48.990 times the weight of a Golf Ball, and the weight of a Golf Ball is 0.02041 times that amount.(per R&A USGA Rules of Golf; maximum rule weight)
According to the Rules of Golf (as approved by the United States Golf Association and the Rules Committee of the Royal and Ancient Golf Club of Saint Andrews), golf balls must weigh no more than 0.000000000045930 megatonnes. Golf balls are not required to have the familiar dimpled pattern, but the design has been popular since its invention in 1905 because it reduces drag while increasing lift.