It's about one-and-one-tenth times as heavy as a liter of Water
In other words, 679 pennyweights is 1.055933 times the weight of a liter of Water, and the weight of a liter of Water is 0.94702980 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 four-fifths as heavy as a Human Brain
In other words, 679 pennyweights is 0.7820 times the weight of a Human Brain, and the weight of a Human Brain is 1.280 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-seven-tenths times as heavy as a Basketball
In other words, 679 pennyweights is 1.69309090910 times the weight of a Basketball, and the weight of a Basketball is 0.590635738830 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 half as heavy as a Chihuahua
In other words, 679 pennyweights is 0.4690 times the weight of a Chihuahua, and the weight of a Chihuahua is 2.130 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 two-and-a-half times as heavy as a Football (Soccer)
In other words, the weight of a Football (Soccer) is 0.40 times 679 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 two-and-a-half times as heavy as a Football (American)
In other words, 679 pennyweights is 2.5688275862070 times the weight of a Football (American), and the weight of a Football (American) is 0.38928264604810 times that amount.(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 255.20833333330 pennyweights and 273.43750 pennyweights. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.
It's about one-third as heavy as a Brick
In other words, the weight of a Brick is 2.80 times 679 pennyweights.(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.