Ключевые слова: air, analytical, background, bottle, chemical, closeup, control, cylinder, cylinders, danger, dangerous, decrease, energy, equipment, fluid, fuel, gas, gauge, healthy, hospital, industrial, industry, instrument, isolated, lab, laboratory, machine, material, measure, measurement, medical, metal, meter, object, oxygen, physical, power, pressure, propane, protection, reduce, regulator, regulators, risk, scale, steel, supply, tank, technology, valve,