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 smallest unit of length is a Planck Length. This is the  equivalent of a millionth of a billionth of a billionth of a  billionth of a centimeter. This is too small for t â¦ he human eye to  see without assistance like a microscope. Answered.