A millimeter (mm) is a unit of length in the International System of Units (SI), equal to one-thousandth of a meter, which is the SI base unit of length. Therefore, there are one thousand millimeters in a meter. A millimeter is a small unit of measurement compared to other units of length such as centimeters, meters, inches, and feet.
Some key facts about millimeters include:
- 1 millimeter is equal to 1000 micrometers or 1000000 nanometers.
- There are 10 millimeters in a centimeter.
- There are 25.4 millimeters in an inch.
- A millimeter is usually the smallest unit of measurement used to express the length of small objects such as the size of an ant, the thickness of a paper, or the length of a wheat grain.
To measure in millimeters, one can use a metric ruler or meter stick. The numbered lines on a metric ruler represent centimeters, while the unmarked lines represent millimeters. One centimeter is equal to 10 millimeters. To measure an object in millimeters, put the zero end of the ruler at the starting edge and count the unnumbered lines until you reach the end of the object.
