It's about two-fifths as long as a Grain of Sand.
In other words, 538 microns is 0.43 times the length of a Grain of Sand, and the length of a Grain of Sand is 2.33 times that amount.(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 1,250 microns. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15,100,000 microns in height.
It's about one-third as long as a Strand of Spaghetti (thickness).
In other words, the length of a Strand of Spaghetti (thickness) is 3.1 times 538 microns.(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 1,700 microns 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 five times as tall as a sheet of Paper.
It's about five-and-a-half times as long as a Strand of Hair.
It's about five-and-a-half times as tall as a Human hair, Strand of.
It's about one-twenty-fifth as long as an Aspirin.
In other words, the length of an Aspirin is 26 times 538 microns.(for up & up aspirin, 325mg, regular strength tablets) (a.k.a. acetylsalicylic acid, a.k.a. ASA)
A single aspirin tablet measures 14,000 microns in diameter. One of the most common medicines in the world and a foundation of worldwide health systems, an estimated 40,000 metric tons of aspirin are consumed each year.
It's about 70 times as long as a Red Blood Cell.
In other words, 538 microns is 72 times the length of a Red Blood Cell, and the length of a Red Blood Cell is 0.014 times that amount.(a.k.a. RBCs, a.k.a. haematids, a.k.a. erythrocyte, a.k.a. erythroid cells, a.k.a. red blood corpuscles) An average Red Blood Cell measures 7.5 µm (micrometers) in diameter. An average human has 20 - 30 trillion red blood cells in their body and each cell completes a circulatory lap in about 20 seconds.