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How long is 2.10 inches?

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It's about one-two-hundred-fiftieth as tall as a Brachiosaurus.
In other words, the height of a Brachiosaurus is 240 times 2.10 inches.
(based on comparable bone measurements, height to head)
Dinosaurs in the genus Brachiosaurus had an estimated height (at the head with neck fully extended) of up to 510 inches. A resin cast of the first Brachiosaurus specimen, owned by the Field Museum in Chicago, is currently on display at the O'Hare International Airport.
It's about one-two-hundred-fiftieth as long as a Semitrailer.
In other words, 2.10 inches is 0.003646 times the length of a Semitrailer, and the length of a Semitrailer is 274.30 times that amount.
(a.k.a. semi-trailer truck, a.k.a. semi, a.k.a. tractor-trailer, a.k.a. truck and trailer, a.k.a. eighteen-wheeler, a.k.a. big rig, a.k.a. Mack truck, a.k.a. transport, a.k.a. lorry, a.k.a. artic; for box truck; United States Federal length limits)
According to the United States Department of Transportation (DOT), the maximum allowable length of a semitrailer pulled by a road tractor truck is 576 inches (unless superseded by state law). These regulations also allow the vehicles to tow up to 36,000 kg in gross weight.
It's about one-three-hundredth as tall as The Hollywood Sign.
In other words, 2.10 inches is 0.0036 times the height of The Hollywood Sign, and the height of The Hollywood Sign is 280 times that amount.
(a.k.a. Hollywoodland Sign) (Mount Lee, Hollywood Hills, Santa Monica Mountains, California)
Each of the white letters in the Hollywood Sign measures 590 inches tall. Built as an advertisement in 1923, the sign was intended to stand for only eighteen months.
It's about one-three-hundred-fiftieth as long as a Bowling Lane.
In other words, 2.10 inches is 0.0027845 times the length of a Bowling Lane, and the length of a Bowling Lane is 359.130 times that amount.
(USBC specifications; tenpin; including pin deck)
According to the United States Bowling Congress specifications, a tenpin bowling lane should measure 754.170 inches. In a Professional Bowling Association game, the lane must be lubricated by about 25 ml (0.85 fl. oz) of oil.
It's about one-four-hundredth as long as a Cricket Pitch.
In other words, 2.10 inches is 0.00265152 times the length of a Cricket Pitch, and the length of a Cricket Pitch is 377.1420 times that amount.
(per Marylebone Cricket Council / International Cricket Council Law #6)
The length of a cricket pitch, from one bowling crease to the other, is 792 inches. The wickets at either end of the pitch stand 28.34650 inches tall including the bails.
It's about 500 times as tall as a sheet of Paper.
In other words, the height of a sheet of Paper is 0.002 times 2.10 inches.
(for US Letter, a.k.a. ANSI A; 215.9mm by 279.4mm (8.5 in x 11 in); 20lb)
A single sheet of 20 lb, 8.5 inch x 11 inch paper is just 0.004 inches thick. This style of paper weighs a mere 5 g per sheet.
It's about one-five-hundredth as long as Baseball base distances.
In other words, 2.10 inches is 0.0019444 times the length of Baseball base distances, and the length of Baseball base distances is 514.30 times that amount.
(MLB Official Baseball Rules specification)
According to MLB Official Baseball Rules, the distance between baseball diamond bases is 1,080 inches. While second and home base are located upon the corners of the 27.432 sq. m area created by the bases, first and third base are placed within that square, to better allow the umpires to judge whether a ball is fair or foul.