The trachea, bronchi and bronchioles form the tracheobronchial tree â a system of airways that allow passage of air into the lungs, where gas exchange occurs.he trachea marks the beginning of the tracheobronchial tree. It arises at the lower border of cricoid cartilage in the neck, as a continuation of the larynx. By Bibi Saint-Pol [CC BY-SA 3.0], via Wikimedia Commons. Fig 1.0 â Overview of the tracheobronchial tree.
While relative masses are nice if you want to compare protons, neutrons and electrons to one another, it doesn't tell you what the actual masses of these particles are. In kilograms, the masses are: Neutron = 1.6749286*10-27 kg.
A hydrogen nucleus is a proton, and the mass of a proton is 1.67Ã10â27kg. The most recent value for the radius of a proton is 8.41Ã10â16m. The mass of a hydrogen atom is 1.67Ã10â27kg. The radius of a hydrogen atom, calculated using self-consistent field functions, is 53 pm or 53Ã10â12m. V=(43)Ïr3=(43)Ï(53Ã10â12m)3=6.24Ã10â31m3. Ï=mV=1.67Ã10â27kg6.24Ã10â31m3=2.7Ã103kg/m3=2.7 kg/dm3.