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.
We know some metric units for measuring length are millimeters, centimeters, meters and kilometers. Millimeters and centimeters are found on a ruler. There is a meter stick that measures 1 meter. A metric tape measure can be used to measure multiple meters.