Gases for industrial and scientific purposes, namely, acetylene, carbon oxygen, carbon monoxide, carbon dioxide, helium, nitrogen, argon, argon mixtures, oxygen, chlorine, ethane, ethylene, hydrogen chloride, hydrogen sulfide, krypton, methane, neon, sulfur hexafluoride, xenon; industrial gases, namely, gases for welding, cutting, purging, blanketing or heat treating; specialty gases, namely, non-petroleum based compressed gases for the pharmaceutical, biotechnology, chemical, petrochemical, environmental, food, semiconductor, or life science industries; specialty gases for general industrial and scientific use in the manufacture and research of a wide variety of goods in the fields of cryo-freezing, carbonation, and hydrogenation; gases for industrial and scientific purposes in the field of research, namely, carrier and support gases and electron capture mixtures; calibration and non-medical gases, namely, pure gases and precision mixtures used in calibrating analytical instruments