It's about two-and-a-half times as long as a Strand of Spaghetti (thickness).
In other words, the length of a Strand of Spaghetti (thickness) is 0.420 times 4 milimeters.(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 1.7 mm 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 three times as long as a Grain of Sand.
In other words, 4 milimeters is 3.20 times the length of a Grain of Sand, and the length of a Grain of Sand is 0.3130 times that amount.(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 1.25 mm. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15,100 milimeters in height.
It's about three-tenths as long as an Aspirin.
In other words, 4 milimeters is 0.290 times the length of an Aspirin, and the length of an Aspirin is 3.40 times that amount.(for up & up aspirin, 325mg, regular strength tablets) (a.k.a. acetylsalicylic acid, a.k.a. ASA)
A single aspirin tablet measures 14 mm 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 one-fifteenth as tall as a Golf Tee.
In other words, the height of a Golf Tee is 14 times 4 milimeters.The most common golf tee size and the length preferred for iron and most wood clubs is 54 milimeters tall. The tee did not come into common use until it was promoted by professional golfers Walter Hagen and Joe Kirkwood, as part of a marketing effort by the patent-holder of the well-known, "Reddy Tee."
It's about 40 times as long as a Strand of Hair.
It's about 40 times as tall as a sheet of Paper.
It's about 40 times as tall as a Human hair, Strand of.