directions (length x width = area). asme american society of mechanical engineers atmospheric pressure the weight of the atmosphere at a given point on earth. [ b ] backwash the process of flow reversal to clean a filter and to restore it to the normal clean condition for filtering with a minimum resistance...
directions (length x width = area). asme american society of mechanical engineers atmospheric pressure the weight of the atmosphere at a given point on earth. [ b ] backwash the process of flow reversal to clean a filter and to restore it to the normal clean condition for filtering with a minimum resistance...