It's about 0.000000008 times as tall as a Mauna Loa.
In other words, 0.0000000750 kilometers is 0.0000000081810 times the height of a Mauna Loa, and the height of a Mauna Loa is 122,200,000 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 9.20 kilometers 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 0.000000007 times as tall as The Challenger Deep (Marianas Trench).
In other words, 0.0000000750 kilometers is 0.00000000687950 times the height of The Challenger Deep (Marianas Trench), and the height of The Challenger Deep (Marianas Trench) is 145,360,000 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 km below sea level. There has been only one manned expedition to the bottom of Challenger Deep — a 1960 voyage that took 4 hours and 48 minutes to reach the bottom.
It's about 0.000000007 times as tall as Maxwell Montes.
In other words, 0.0000000750 kilometers is 0.00000000680 times the height of Maxwell Montes, and the height of Maxwell Montes is 150,000,000 times that amount.(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 11 km. 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 0.000000003 times as tall as Olympus Mons.
In other words, 0.0000000750 kilometers is 0.00000000280 times the height of Olympus Mons, and the height of Olympus Mons is 360,000,000 times that amount.(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 27 km. 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 0.0000000009 times as long as The Panama Canal.
In other words, 0.0000000750 kilometers is 0.000000000850 times the length of The Panama Canal, and the length of The Panama Canal is 1,200,000,000 times that amount.(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 88 kilometers in length. Ships passing through the Canal are raised (and then lowered) 0.026 kilometers above sea level through the lock-and-dam system.
It's about 0.0000000007 times as long as The English Channel.
In other words, 0.0000000750 kilometers is 0.0000000007010 times the length of The English Channel, and the length of The English Channel is 1,430,000,000 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 180 km to 34 km, 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 0.0000000007 times as long as The 405.
In other words, 0.0000000750 kilometers is 0.000000000643560 times the length of The 405, and the length of The 405 is 1,553,900,000 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 116.541 km. The 405 is the most heavily-trafficed freeway in the United States, with an average speed as low as 8 kph during rush hours.