gas mark 4/5/6 etc
From Longman Dictionary of Contemporary Englishgas mark 4/5/6 etcgas mark 4/5/6 etcBritish EnglishDFC a measurement of the temperature of a gas oven → gasExamples from the Corpusgas mark 4/5/6 etc• Place pan in a preheated hot oven 200 °C gas mark 6.