Ddischarge tube led to the discovery of Cathode rays (electrons) and Positive rays (protons) so this discovery of cathode rays and positive rays can be considered as conse quences of discharge tube.
The principal scope is to realize chemical reactions on a very small scale. Also: storing liquid or solid substances, solubility experiments, etc. A test tube is a cylindrical tube, made from...
They terminate at the alveolar sacs which contain the alveoli. Here inhaled O2 is exchanged for exhaled CO2 via the pulmonary veins (which transport de-oxygenated blood with CO2), to the pulmonary...