It's about 35,000 times as heavy as a Puck (Hockey)
In other words, 0.00000610 megatonnes is 37,421.072676946 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 0.0000267229111424180 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 40,000 times as heavy as a Baseball
In other words, 0.00000610 megatonnes is 41,984.6181253540 times the weight of a Baseball, and the weight of a Baseball is 0.0000238182468878080 times that amount.(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 0.0000000001417476156250 megatonnes and 0.000000000148834996406250 megatonnes. A major league pitcher can throw a baseball at up to 150 kph (91 mph) (with a fastball pitch), with record-setting pitches as fast as 171 kph (106 mph).
It's about 45,000 times as heavy as a Battery (D)
In other words, 0.00000610 megatonnes is 45,200 times the weight of a Battery (D), and the weight of a Battery (D) is 0.00002210 times that amount.(Alkaline)
A "D" size battery weighs 0.0000000001350 megatonnes. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
It's about one-fifty-five-thousandth as heavy as The Empire State Building
It's about 65,000 times as heavy as a Deck of Cards
In other words, the weight of a Deck of Cards is 0.0000150 times 0.00000610 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 95,000 times as heavy as a Battery (C)
In other words, the weight of a Battery (C) is 0.0000110 times 0.00000610 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 100,000 times as heavy as a Tennis Ball
In other words, 0.00000610 megatonnes is 106,000 times the weight of a Tennis Ball, and the weight of a Tennis Ball is 0.000009430 times that amount.(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.