инструментальный воздух(The term "Instrument Air" refers to an extremely clean supply of compressed air that is free from contaminates such as moisture & particulates. A system may utilize instrument air for various types of pneumatic equipment, valves & electrical controls. unitedfiltration.com/what-is-instrument-air/ Alexander Demidov)
нормальные условия(Air with a weight of 0.075 pounds per cubic foot with an equivalent density of dry air at a temperature of 86 degrees Fahrenheit and standard barometric pressure of 29.92 inches of mercury. Found on – st.air electromn.comAlexander Demidov)