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How long is 100 meters?

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It's about one-forty-five-thousandth as long as I-80
In other words, 100 meters is 0.00002156090 times the length of I-80, and the length of I-80 is 46,380.30 times that amount.
(a.k.a. Interstate 80, a.k.a. Keystone Shortway) (net length)
Interstate 80, crosses the continent of North America from Teaneck, New Jersey to San Francisco, California and covers a total length of 4,638,030 meters. A 60,000 meters stretch between mile marker 318 in Grand Island, Nebraska and mile marker 390 in Lincoln, Nebraska is the longest straight path in the US Interstate system.
It's about 60,000 times as long as a Strand of Spaghetti (thickness)
In other words, 100 meters is 59,000 times the length of a Strand of Spaghetti (thickness), and the length of a Strand of Spaghetti (thickness) is 0.0000170 times that amount.
(average; restaurant and supermarket applications) (based on FMA Omcan Italian Made TR50 Counter Top Pasta Machine Extruder 13317)
An average strand of restaurant-grade spaghetti measures 0.0017 meters in thickness. In 2010, a California Buca di Beppo set a world record by preparing a 13,780-lb bowl of spaghetti, served in a swimming pool.
It's about one-sixty-five-thousandth as long as The Great Wall of China (wall only)
In other words, 100 meters is 0.000015980 times the length of The Great Wall of China (wall only), and the length of The Great Wall of China (wall only) is 62,580 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (wall segments only)
The Great Wall of China has total wall segment length of 6,259,000 meters. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about one-sixty-five-thousandth as long as The Amazon River
In other words, 100 meters is 0.000015540 times the length of The Amazon River, and the length of The Amazon River is 64,350 times that amount.
(from Nevado Mismi, Arequipa, Peru through near Marajó, Brazil) (approximate distance)
The Amazon River has an approximate distance of 6,437,000 meters. Although by most measures it is the largest and one of the most significant rivers in the world, the region surrounding the Amazon is mostly sparsely populated and the river itself has no bridges across it at any point.
It's about 80,000 times as long as a Grain of Sand
In other words, the length of a Grain of Sand is 0.00001250 times 100 meters.
(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 0.00125 meters. 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 one-ninety-thousandth as long as The Great Wall of China (total)
In other words, 100 meters is 0.00001130 times the length of The Great Wall of China (total), and the length of The Great Wall of China (total) is 88,500 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (total length, all branches)
The Great Wall of China, including all branches and trenches, is 8,850,000 meters. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about one-one-hundred-fifty-thousandth as long as The Diameter of Earth
In other words, 100 meters is 0.00000783928020 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 127,562.730 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 12,756,273 m at the Equator. The first complete view of Earth's diameter was in a photograph taken from a V-2 rocket launched in 1946 by the United States Army, which reached an altitude of 104,607.360 meters.