Gas Mark

The Gas Mark is a system of marking temperatures on Gas Ovens and cookers in the UK and commonwealth countries. It is still in use, however it is not as widespread as 50 years ago.
onversation between the British Gas Mark, Fahrenheit, Celsius
Gas mark !! Fahrenheit !! Celsius !!Verbal
/4 225 110 Very Slow/Very Low
/2 250 120 Very Slow/Very Low
||275||140||Slow/Low
||300||150||Slow/Low
||325||160-170||Moderately Slow/Warm
||350||180||Moderate/Medium
||375||190||Moderate/Moderately Hot
||400||200||Moderately Hot
||425||220||Hot
||450||230||Hot/Very Hot
||475||250||Very Hot
Different manufacturers and oven types do vary, so always refer to your cooker instruction book. In general, the conversions between a Gas Mark temperature T_G and a Fahrenheit temperature T_F are given by T_F = \begin{cases} 25 \log_2(T_G) + k_f & \mbox{if }T_G \le 1\\ 25 (T_G-1)+k_f & \mbox{if }T_G\ge 1\end{cases} and T_G = \begin{cases} 2^{\frac{T_F-k_f}{25}} & \mbox{if }T_F \le k_f \\ \frac{T_F-k_f}{25}+1&\mbox{if }T_F\ge k_f \end{cases} where the Fahrenheit constant k_f takes the value k_f = 275.
   

 

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