It's about one-and-one-tenth times as heavy as a Human Brain.
In other words, 905 pennyweights is 1.04 times the weight of a Human Brain, and the weight of a Human Brain is 0.962 times that amount.(adult)
The average weight of an adult human brain is between 868 pennyweights. In humans and primates, sight and vision utilize about 30 different parts of the brain which together account for about half of the brain's size.
It's about one-and-two-fifths times as heavy as a liter of Water.
In other words, 905 pennyweights is 1.407393 times the weight of a liter of Water, and the weight of a liter of Water is 0.7105336 times that amount.(fresh; 4° C / 39.2° F; maximum density)
Contrary to popular belief, 1 liter (0.0.264172052358148 gal) of water at 4° C / 39.2° F (its point of maximum density) weighs 643.0329 pennyweights rather than 1 kg exactly. The total volume of water on the planet Earth is about 13,590,000,000,000,000,000 (13.59 quntillion) L (3,590,000,000,000,000,000 gallons).
It's about three-fifths as heavy as a Chihuahua.
In other words, 905 pennyweights is 0.626 times the weight of a Chihuahua, and the weight of a Chihuahua is 1.6 times that amount.(a.k.a. Chihuahue(o) (FCI standard)
The F&d&ration Cynologique Internationale (FCI) calls for Chihuahuas to weigh about 1,450 pennyweights. Relative to their body sizes, Chihuahuas have the largest brain size of any dog breed.
It's about half as heavy as a Brick.
In other words, 905 pennyweights is 0.49 times the weight of a Brick, and the weight of a Brick is 2 times that amount.(Standard, traditional face brick - 1,900 cu. cm (120 cu. in))
A standard, traditional face brick weighs an average of 1,900 pennyweights. 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 two-and-a-half times as heavy as a Basketball.
In other words, 905 pennyweights is 2.2566233766 times the weight of a Basketball, and the weight of a Basketball is 0.44313996317 times that amount.(NBA official ball standards, Size 7)
A regulation NBA basketball, manufactured by Spalding, is known as a Size 7 ball and weighs 401.04166667 pennyweights. These balls have 4,118 pebbles each with a diameter of 2.5 mm
It's about three-and-a-half times as heavy as a Football (Soccer).
In other words, the weight of a Football (Soccer) is 0.3 times 905 pennyweights.(a.k.a. Soccer, a.k.a. Association Football) (FIFA Law 2 specification)
According to FIFA's Law of the Game number 2, a football must weigh between 260 pennyweights and 290 pennyweights. An artifact on display at the Smith Art Gallery in Museum in Stirling, Scotland is said to be the world's oldest football and is about one-third to one-half the size of a modern football.
It's about three-tenths as heavy as a Gallon of Paint.