A colorless gas burned in combination with oxygen for oxyacetylene welding. Explosive, especially if used in welding with Flammable!gauge pressures over 15 psig (30 psig absolute). It has a garlic-like odor. Tank sizes available are 10, 40, 75, 100, and 300 cubic feet.(pr. ə-SE-tə-leen)Also see arc welding, argon, carbon dioxide, flammable, helium, hydrogen, nitrogen, and oxygen.