7. gas mark n. (also with capital initials) Brit. Cookery (with following numeral) a specific temperature setting on a standard scale used for measuring oven temperature.
The precise temperatures can vary slightly, but broadly the scale rises in 25°F (approx. 14°C) increments from gas mark 1 at 275°F (approx. 135°C) to gas mark 9 at 475°F (approx. 246°C).
1958 Berkshire Cookery Bk. (Berks. Federation Women's Institute) 1 (table) Oven chart… Type of Food..Gas Mark..approx. Temp. Centre Oven [etc.]. 1963 H. BURKE Pract. Cookery 170 Bake at 150 °C, 300 °F or Gas Mark 2 for 1 3/4 to 2 hours. Unmould cake when cool.
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