(a) A gas which has a critical temperature above 700C; and (b) a toxic substance which is liquid at a pressure of 101 kPa at 00C but which boils at or below 3000C at that pressure
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}