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.
The metric measure units of length are based on the meter. 1  The millimeter (mm) is the smallest metric measure of length and equals 1/1000 of a meter. 2  The centimeter (cm) is the next largest unit of length and equals 1/100 of a meter.  The decimeter (dm) is the next largest unit of length and equals 1/10 of a meter.