It's about one-four-hundredth as heavy as an Anchor of a Cruise Ship
In other words, 0.0000000300 megatonnes is 0.00265 times the weight of an Anchor of a Cruise Ship, and the weight of an Anchor of a Cruise Ship is 377 times that amount.(for QE2 forward anchor, a.k.a. RMS Queen Elizabeth 2)
Each of the forward anchors of the RMS Queen Elizabeth 2 weighs 0.00001130 megatonnes. The anchor of the QE2 now sits in front of the Holyrood Church in Southampton, England, United Kingdom, along a pedestrian tourist route known as "the QE2 mile."
It's about 450 times as heavy as a Battery (C)
In other words, the weight of a Battery (C) is 0.0022 times 0.0000000300 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 500 times as heavy as a Tennis Ball
In other words, the weight of a Tennis Ball is 0.00192 times 0.0000000300 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 650 times as heavy as a Golf Ball
In other words, 0.0000000300 megatonnes is 653.20 times the weight of a Golf Ball, and the weight of a Golf Ball is 0.001531 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.
It's about 900 times as heavy as a Light Bulb
In other words, 0.0000000300 megatonnes is 880 times the weight of a Light Bulb, and the weight of a Light Bulb is 0.0011 times that amount.(a.k.a. lamp) (for A19-size, 60w, incandescent bulb by Bulbrite; package weight)
A standard, sixty-watt light bulb weighs about 0.0000000000340 megatonnes. The tightly-coiled filament inside a bulb of this size would measure about 579mm if uncoiled and stretched out.
It's about 1,500 times as heavy as a Battery (AA)
In other words, the weight of a Battery (AA) is 0.00077 times 0.0000000300 megatonnes.(Alkaline)
An "AA" size battery weighs 0.0000000000240 megatonnes. AA batteries came into common use during World War II and were given their name by the American National Standards Institute (ANSI) Committee C18 because they were smaller than the "A" size batteries which were invented first.
It's about 1,500 times as heavy as a Mouse
In other words, the weight of a Mouse is 0.00071 times 0.0000000300 megatonnes.(a.k.a. "House mouse", Mus musculus) (adult)
The weight of a mouse is typically an average of 0.0000000000210 megatonnes. While most mice typically live two to three years, the Methuselah Mouse Prize — an award administered by a non-profit organization which advances aging-related research — was once awarded to a team of scientists whose research resulted in a mouse living just under five years.