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How heavy is 420 kilograms?

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It's about one-eight-hundred-thousandth as heavy as The Empire State Building
In other words, 420 kilograms is 0.000001270 times the weight of The Empire State Building, and the weight of The Empire State Building is 787,000 times that amount.
(New York City, New York)
The Empire State Building weighs approximately 331,000,000 kilograms. About 4% of the building's weight is its 6,000 cu. m (200,000 cu. ft) of limestone façade.
It's about 0.0000005 times as heavy as The Golden Gate Bridge
In other words, 420 kilograms is 0.0000005220 times the weight of The Golden Gate Bridge, and the weight of The Golden Gate Bridge is 1,920,000 times that amount.
(San Francisco, California and Marin County, California) (Post 1986 weight reduction; total weight of bridge, anchorage, and approaches)
Following the completion of the 1986 project to eliminate excess material, the total weight of the Golden Gate Bridge — including its anchorages and approaches — is 805,000,000 kilograms. The two main cables in the spanning the bridge are spun out of a total of 129,000 km (80,200 mi) of wire.
It's about 2,000,000 times as heavy as a Raindrop
In other words, the weight of a Raindrop is 0.000000500 times 420 kilograms.
(a.k.a. drop, a.k.a. droplet) (average)
The weight of a raindrop depends heavily on the type of weather, but averages about 0.0002 kilograms. The familiar teardrop shape of a raindrop is actually an optical illusion, caused by the reflection of the light and the motion of the drop.
It's about 15,000,000 times as heavy as a Grain of Rice
In other words, the weight of a Grain of Rice is 0.0000000710 times 420 kilograms.
(long grain; 14% moisture content)
A single long grain of rice weighs an average of 0.0000290 kilograms. A staple through most of human history, archaeological evidence indicates that the earliest rice cultivation was about 11,500 years ago.
It's about 0.00000007 times as heavy as The Great Pyramid of Giza
In other words, 420 kilograms is 0.0000000710 times the weight of The Great Pyramid of Giza, and the weight of The Great Pyramid of Giza is 14,000,000 times that amount.
(a.k.a. Pyramid of Khufu, a.k.a. Pyramid of Cheops) (Cairo, Egypt)
The Great Pyramid of Giza has an estimated mass of 5,900,000,000 kilograms. The 2,300,000 stones used in the construction of the pyramid weighed an average 2,300 kilograms and were quarried from distances of up to 805 km (500 mi) away.
It's about 95,000,000 times as heavy as a Grain of Sand
In other words, the weight of a Grain of Sand is 0.0000000110 times 420 kilograms.
(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.00000440 kilograms. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.
It's about 100,000,000 times as heavy as a Sesame Seed
In other words, 420 kilograms is 115,000,000 times the weight of a Sesame Seed, and the weight of a Sesame Seed is 0.00000000870 times that amount.
(Sesamum indicum)
A sesame seed weighs approximately 0.000003640 kilograms. The McDonald's Big Mac sandwich, which is well-known for its sesame seed top bun, accounts for the consumption of an estimated 2,009.32 kg of sesame seeds each day.