It's about 400 times as heavy as a liter of Water
In other words, 420 kilograms is 419.9882 times the weight of a liter of Water, and the weight of a liter of Water is 0.00238102 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 1.000028 kg 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 650 times as heavy as a Basketball
In other words, 420 kilograms is 673.41200086 times the weight of a Basketball, and the weight of a Basketball is 0.001484975021 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 0.623689508750 kilograms. These balls have 4,118 pebbles each with a diameter of 2.5 mm
It's about 1,000 times as heavy as a Football (Soccer)
In other words, 420 kilograms is 980 times the weight of a Football (Soccer), and the weight of a Football (Soccer) is 0.00 times that amount.(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 0.410 kilograms and 0.450 kilograms. 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 1,000 times as heavy as a Football (American)
In other words, 420 kilograms is 1,021.728553022 times the weight of a Football (American), and the weight of a Football (American) is 0.000978733536459 times that amount.(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 0.396893323750 kilograms and 0.4252428468750 kilograms. 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 1,000 times as heavy as a Can of Soup
In other words, 420 kilograms is 1,200 times the weight of a Can of Soup, and the weight of a Can of Soup is 0.0008 times that amount.(for Campbell''s Condensed Tomato Soup, 317.9 ml)
A can of Campbell''s Tomato Soup weighs 0.350 kilograms. Cans have been used to store soup and other foods since their invention in 1913, but a dedicated can opener was not developed until cans began to use thinner materials — prior to that time, cans were usually opened using various blunt instruments and tools.
It's about 1,500 times as heavy as a Human Heart
In other words, 420 kilograms is 1,400 times the weight of a Human Heart, and the weight of a Human Heart is 0.0007 times that amount.(human; adult)
The average human heart weighs about 0.310 kilograms. Each minute, the heart pumps between 10 and 20 liters (3 to 5 gallons) of blood through its chambers.
It's about one-one-thousand-five-hundredth as heavy as Christ the Redeemer (statue)
In other words, 420 kilograms is 0.00066 times the weight of Christ the Redeemer (statue), and the weight of Christ the Redeemer (statue) is 1,510 times that amount.(a.k.a. O Cristo Redentor, a.k.a. Christo redemptor) (Rio de Janeiro, Brazil)
Christ the Redeemer weighs 635,000 kilograms. The statue overlooks the city of Rio de Janeiro from atop the 709.9-meter (2,329 ft) granite peak in the Tijuca Forest National Park.