It's about 200 times as heavy as a Puck (Hockey)
In other words, 0.0000000300 megatonnes is 184.03806234564 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 0.0054336585989582 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 200 times as heavy as a Hamster
In other words, the weight of a Hamster is 0.005 times 0.0000000300 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 one-two-hundredth as heavy as an Elephant
In other words, the weight of an Elephant is 200 times 0.0000000300 megatonnes.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 0.00000610 megatonnes. Among African elephants, both males and females have tusks (whereas female Asian elephants, Elephas maximus, do not have tusks) which can grow to 3 m (10 ft) and typically weigh about 0.00000400 megatonnes
It's about 200 times as heavy as a Baseball
In other words, 0.0000000300 megatonnes is 206.481728485350 times the weight of a Baseball, and the weight of a Baseball is 0.0048430435338541 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 one-two-hundredth as heavy as a Tyrannosaurus rex
In other words, 0.0000000300 megatonnes is 0.0047 times the weight of a Tyrannosaurus rex, and the weight of a Tyrannosaurus rex is 210 times that amount.(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)
The notable Tyrannosaurus specimen housed at the Field Museum of Natural History in Chicago, Illinois, "Sue," is estimated to have weighed about 0.00000640 megatonnes while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.
It's about 200 times as heavy as a Battery (D)
In other words, 0.0000000300 megatonnes is 222 times the weight of a Battery (D), and the weight of a Battery (D) is 0.0045 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 300 times as heavy as a Deck of Cards
In other words, 0.0000000300 megatonnes is 320 times the weight of a Deck of Cards, and the weight of a Deck of Cards is 0.0031 times that amount.(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.