It's about one-one-hundredth as heavy as The Empire State Building
In other words, 0.00273 megatonnes is 0.00825 times the weight of The Empire State Building, and the weight of The Empire State Building is 121 times that amount.(New York City, New York)
The Empire State Building weighs approximately 0.3310 megatonnes. About 4% of the building's weight is its 6,000 cu. m (200,000 cu. ft) of limestone façade.
It's about one-three-hundredth as heavy as The Golden Gate Bridge
In other words, 0.00273 megatonnes is 0.00339 times the weight of The Golden Gate Bridge, and the weight of The Golden Gate Bridge is 295 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 0.8050 megatonnes. 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 one-two-thousandth as heavy as The Great Pyramid of Giza
In other words, 0.00273 megatonnes is 0.00046 times the weight of The Great Pyramid of Giza, and the weight of The Great Pyramid of Giza is 2,200 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 5.90 megatonnes. The 2,300,000 stones used in the construction of the pyramid weighed an average 0.00000230 megatonnes and were quarried from distances of up to 805 km (500 mi) away.
It's about 0.0000000000000000005 times as heavy as The Earth
In other words, 0.00273 megatonnes is 0.000000000000000000457010 times the weight of The Earth, and the weight of The Earth is 2,188,100,000,000,000,000.000000000000000000000000 times that amount.The mass of the planet Earth is 5,973,600,000,000,000.000000000000000000000 megatonnes. The element iron makes up about 32% of that mass, or 1,917,500,000,000,000.000000000000000000000 megatonnes.
It's about 0.000000000000000000000002 times as heavy as The Sun
In other words, 0.00273 megatonnes is 0.00000000000000000000000140 times the weight of The Sun, and the weight of The Sun is 710,000,000,000,000,004,194,304.00000000000000000000000000 times that amount.The sun has a mass of 1,999,999,999,999,999,966,445,568.000000000000000000000000000 megatonnes which represents 99.9% of the solar system's total mass. 98.7% of the sun's mass consists of hydrogen and helium — respectively the lightest and second-lightest elements in the universe.