It's about one-two-hundred-fifty-thousandth as tall as a Mauna Loa
In other words, 37.50 milimeters is 0.00000409 times the height of a Mauna Loa, and the height of a Mauna Loa is 244,500 times that amount.(Hawaii) (Hawaiian island volcano) (total height from seafloor)
Mauna Loa, one of the five volcanoes which forms the island of Hawaii and the tallest mountain in total height in the world, rises to 9,200,000 milimeters above the seafloor. The peak of Loa is home to the approximately 6,000 sq. m (0.6 ha) Lake Waiau, one of the highest altitude lakes in the United States outside of Colorado.
It's about one-three-hundred-thousandth as deep as The Challenger Deep (Marianas Trench)
In other words, 37.50 milimeters is 0.0000034397 times the depth of The Challenger Deep (Marianas Trench), and the depth of The Challenger Deep (Marianas Trench) is 290,720 times that amount.(near Marianas Islands, a.k.a. Ladrones Islands, northwestern Pacific Ocean) (depth below sea level)
The Challenger Deep, at the southern end of the Marianas Trench, reaches a depth of 10,902,000 milimeters below sea level. The first manned expedition to the bottom of Challenger Deep took 4 hours and 48 minutes in 1960. This was the only manned descent to the floor of the Trench until 2012, when director James Cameron made the trip; several other descents have been made since then.
It's about one-three-hundred-thousandth as tall as Maxwell Montes
In other words, 37.50 milimeters is 0.0000034 times the height of Maxwell Montes, and the height of Maxwell Montes is 290,000 times that amount.(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 11,000,000 milimeters. Since Venus does not seem to have the kind of tectonic activity which gives rise to mountains on Earth, the origin of the Venusian mountain remains the subject of some dispute.
It's about one-seven-hundred-thousandth as tall as Olympus Mons
In other words, 37.50 milimeters is 0.0000014 times the height of Olympus Mons, and the height of Olympus Mons is 710,000 times that amount.(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 27,000,000 milimeters. The mountain has been known to astronomers since the nineteenth century because it is tall enough to rise above Mars' frequent dust storms.
It's about 0.0000005 times as long as The Panama Canal
In other words, 37.50 milimeters is 0.00000043 times the length of The Panama Canal, and the length of The Panama Canal is 2,300,000 times that amount.(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 88,000,000 milimeters in length. Ships passing through the Canal are raised (and then lowered) 26,000 milimeters above sea level through the lock-and-dam system.
It's about 0.0000004 times as wide as The English Channel
In other words, 37.50 milimeters is 0.00000035 times the width of The English Channel, and the width of The English Channel is 2,860,000 times that amount.(average width between Isle of Ushant and The Walde Lighthouse) (La Manche, Ärmelkanal, Mor Breizh, Mor Bretannek) (a.k.a. The Channel)
The English Channel measures between 107,000,000 milimeters, narrowing as it flows northeast. The world speed record for a Channel crossing by swimmer was set by Australian Trent Grimsey in 2012, with a time of 6 hours, 55 minutes.
It's about 0.0000003 times as long as The 405
In other words, 37.50 milimeters is 0.00000032178 times the length of The 405, and the length of The 405 is 3,107,700 times that amount.(a.k.a. I-405, Interstate 405, San DIego Freeway) (Southern California)
Running from Irvine to San Fernando, The 405 runs a total of 116,540,000 milimeters. The 405 is the most heavily-trafficed freeway in the United States, with an average speed as low as 8 kph during rush hours.