This video shows why you cant always trust all information on the internet, as well as shows the basics of torque wrenches and a few oddball calculations you might run across when building custom things.
Underground mine ventilation. Underground mine ventilation provides a flow of air to the underground workings of a mine of sufficient volume to dilute and remove dust and noxious gases (typically NOx, SO2, methane, CO2 and CO) and to regulate temperature.
1 Oxygen then diffuses into the cells, and carbon dioxide enters the blood. 2  The blood then circulates back to the lung, where the process begins again. 3  Definition of Ventilation Ventilation is the process of moving gases through the respiratory tract. In other words, oxygen diffuses towards the blood and is taken up by hemoglobin, and carbon dioxide diffuses towards the alveolus and mixes with the air. 2  No âactive processâ is involved. 3  Oxygen simply diffuses through the membrane and plasma, and is taken up by the red blood cells.