Section 2(1)(w) in Petroleum and Natural Gas Regulatory Board (Technical Standards and Specifications including Safety Standards for LPG Storage, Handling and Bottling Facilities) Regulations, 2019
(w)"Liquefied Petroleum Gas (LPG)" means a mixture of light hydrocarbons containing propane, isobutene, normal butane, butylene, or such other substance which is gaseous at normal ambient temperature and atmospheric pressure but may be condensed to liquid state at normal ambient temperature by the application of pressure and conforms to IS:4576 or IS 14861";