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# Gas Mark

The Gas Mark is a temperature scale used on gas ovens and cookers in the United Kingdom and some Commonwealth of Nations countries. It is still in use and is the most common temperature scale on new gas ovens sold in the UK, with very few models being labelled in degrees Celsius instead.

The draft 2003 edition of the Oxford English Dictionary lists the earliest known usage of the concept as being in L. Chatterton's book Modern Cookery published in 1943: "Afternoon tea scones… Time: 20 minutes. Temperature: Gas, Regulo Mark 7". This particular example also illustrates the term in combination with the word "regulo". This usage pattern is now almost obsolete, but still used by some of the older members of society.

The term "gas mark" was a subject of the joint BBC / OED TV series Balderdash & Piffle, in May 2005, which sought to establish the history of the term. The earliest printed evidence of use of "gas mark" (with no other terms between the two words) appears to date from 1958.

Conversion table
Gas mark Fahrenheit Celsius Verbal
225° 107° Very Slow/Very Low
250° 121° Very Slow/Very Low
1 275° 135° Slow/Low
2 300° 149° Slow/Low
3 325° 163° Moderately Slow/Warm
4 350° 177° Moderate/Medium
5 375° 191° Moderate/Moderately Hot
6 400° 204° Moderately Hot
7 425° 218° Hot
8 450° 232° Hot/Very Hot
9 475° 246° 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

$T_F = begin\left\{cases\right\} 25 log_2\left(T_G\right) + k_f & mbox\left\{if \right\}T_G le 1 25 \left(T_G-1\right)+k_f & mbox\left\{if \right\}T_Gge 1end\left\{cases\right\}$

and

$T_G = begin\left\{cases\right\} 2^\left\{frac\left\{T_F-k_f\right\}\left\{25~^circmathrm\left\{F\right\}\right\}\right\} & mbox\left\{if \right\}T_F le k_f frac\left\{T_F-k_f\right\}\left\{25~^circmathrm\left\{F\right\}\right\}+1&mbox\left\{if \right\}T_Fge k_f end\left\{cases\right\}$

where kf = 275 °F.

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