They can last for a few hours up to weeks at a time. Also within this time frame after quitting, convulsions or seizures can occur, which is the point at which alcohol withdrawal can become dangerous if not medically treated. The symptoms may progress to delirium tremens (DT's) after three to five days without alcohol.
I would like to add that in US most of Instrument Ait pressure is 20-25 psi in the system and Plant (Service) Air pressure is 80-120 psi (about 7 atm). Both system require dryers, filters and some other equipment to do air conditioning.
Interpretation: The bigger the difference between the temperature of the air and the wet-bulb temperature, the relatively drier the air must be. Hence, the difference between the temperature and the wet-bulb temperature is a measure of how close to saturation the air is.We can measure the wet-bulb temperature and the air temperature using a sling psychrometer (demonstrated in class).Using tables such as those in Appendix D of your textbook, we can use these measurements to look up the relative humidity and the dew-point temperature.nterpretation: The bigger the difference between the temperature of the air and the wet-bulb temperature, the relatively drier the air must be. Hence, the difference between the temperature and the wet-bulb temperature is a measure of how close to saturation the air is.