Breathing is then done through the tube, bypassing the mouth, nose, and throat. A tracheostomy is commonly referred to as a stoma. This is the name for the hole in the neck that the tube passes through.
A millimeter (mm) is the smallest. In order from smallest to largest they rank millimeter, centimeter (cm), decimeter (dm), and meter (m). These are all common units of length in the metric system.
Millimeters are the smallest units of length that are in everyday use. The millimeter is one thousandth of the meter, which is one of the basic SI3 units. It consists of 1000 micrometers (1 000 000 nanometers). The following video will show you how to measure length with a regular metric ruler: