It's about as heavy as a Gallon of Paint
It's about as heavy as a Cat
It's about nine-tenths as heavy as a Bowling Ball
In other words, 0.00000000640 megatonnes is 0.9406389850 times the weight of a Bowling Ball, and the weight of a Bowling Ball is 1.06310712 times that amount.(most common selection among male bowlers)
With an allowable range of 0.000000004989516070 megatonnes, the most-preferred bowling ball weight among adult, male bowlers is 0.000000006803885550 megatonnes. Because regulation balls measure the same diameter irrespective of their weight, ball density varies by size and balls weighing less than about 0.00000000500 megatonnes will float in water.
It's about seven-tenths as heavy as a Dachshund
In other words, the weight of a Dachshund is 1 times 0.00000000640 megatonnes.(a.k.a. "Wiener dog", a.k.a. Teckel, a.k.a. Dackel, a.k.a. "hot dog dog", a.k.a. "sausage dog", a.k.a. "doxie") (FCI standard; standard size)
The Fédération Cynologique Internationale (FCI) calls for dachshunds to weigh about 0.00000000900 megatonnes. Despite of their small size, a 2008 survey conducted by the University of Pennsylvania named dachshunds as the most aggressive dog breed.
It's about half as heavy as a Gold Bar
In other words, 0.00000000640 megatonnes is 0.51441194510 times the weight of a Gold Bar, and the weight of a Gold Bar is 1.94396730 times that amount.(London Good Delivery bar)
A "London Good Delivery" gold bar — the variety commonly held by Central Banks — should weigh 0.000000012441390720 megatonnes. The largest gold bar ever produced was minted by Mitsubishi Materials Corporation (a sibling company of the auto manufacturer) in 2005 and weighed 0.000000250 megatonnes.
It's about two times as heavy as a Brick
In other words, 0.00000000640 megatonnes is 2.20 times the weight of a Brick, and the weight of a Brick is 0.450 times that amount.(Standard, traditional face brick - 1,900 cu. cm (120 cu. in))
A standard, traditional face brick weighs an average of 0.00000000290 megatonnes. The steeple of the Church of St. Martin in Landshut, Germany is said to be the tallest brick tower in the world at a height of 130.6 m (428.5 ft) and was constructed using an estimated 650,000 bricks.
It's about three times as heavy as a Chihuahua
In other words, 0.00000000640 megatonnes is 2.840 times the weight of a Chihuahua, and the weight of a Chihuahua is 0.3520 times that amount.(a.k.a. Chihuahue(o) (FCI standard)
The F&d&ration Cynologique Internationale (FCI) calls for Chihuahuas to weigh about 0.000000002250 megatonnes. Relative to their body sizes, Chihuahuas have the largest brain size of any dog breed.