It's about one-three-hundredth as heavy as a Tree (Sierra Redwood)
In other words, 0.00000400 megatonnes is 0.0031 times the weight of a Tree (Sierra Redwood), and the weight of a Tree (Sierra Redwood) is 320 times that amount.(a.k.a. Giant Sequoia, a.k.a. Sierran redwood, a.k.a. Wellingtonia, a.k.a. "Big Tree", Sequoiadendron giganteum)
The weight of wood in a Giant Sequoia is 0.0013 megatonnes. General Sherman, a specimen in Sequoia National Park in Visalia, California, is the largest tree in the world by volume, with an estimated weight of about 0.0019 megatonnes.
It's about 400 times as heavy as a Dachshund
In other words, the weight of a Dachshund is 0.003 times 0.00000400 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 600 times as heavy as a Bowling Ball
In other words, 0.00000400 megatonnes is 587.8993660 times the weight of a Bowling Ball, and the weight of a Bowling Ball is 0.00170097139 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 800 times as heavy as a Gallon of Paint
It's about 900 times as heavy as a Cat
In other words, the weight of a Cat is 0.001 times 0.00000400 megatonnes.(Felis catus) (Domestic; healthy weight)
The average domestic cat should weigh between 0.00000000500 megatonnes. Cats are known for their righting reflex, which allows them to land on their feet and survive falls from heights of 1 m (3 ft) up to about 21 m.
It's about 1,500 times as heavy as a Brick
In other words, the weight of a Brick is 0.00071 times 0.00000400 megatonnes.(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 2,000 times as heavy as a Chihuahua
In other words, 0.00000400 megatonnes is 1,780 times the weight of a Chihuahua, and the weight of a Chihuahua is 0.000562 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.