Recognised as Gas mark

Gas mark 1/2

Gas 1/2
120 °C
very cool

Gas mark 1/2 is 120 °C or 250 °F, a very cool oven. In a fan oven use about 100 °C, since fan ovens are conventionally set 20 °C lower. The gas scale is not linear, so it is a lookup rather than a conversion.

Temperatures

Gas mark1/2

Celsius120 °C

Fahrenheit250 °Fthe conventional published figure, not a recomputed conversion

Fan oven100 °Cconventionally 20 °C below a conventional oven

Oven descriptionVery cool

Exact conversion of the Celsius figure248 °Frecipes round this to the published Fahrenheit value above

The scale

Position2 of 11

Step to the next mark20 °C

LinearNomarks 1 to 5 step by 10 °C, but 6 to 7 and 8 to 9 step by 20 °C

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Other gas marks

Also reads as

GaSmArK12 (chemical formula)

Formula
729.209 g/mol
15 atoms

GaSmArK12 has a molar mass of 729.209 g/mol, made up of 15 atoms across 4 elements: 1 × Ga, 1 × Sm, 1 × Ar, 12 × K.

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Molar mass

Molar mass729.209 g/mol

Total atoms per molecule15

Distinct elements4

Mass of one molecule1.21088 × 10^-21 g

Molecules per gram8.2584564 × 10^20

Name

NameNot in the name tablea name cannot be worked out from a formula alone: isomers share formulas, and naming depends on bonding the formula does not show

Composition by mass

Ga9.6%

Sm20.6%

Ar5.5%

K64.3%

Gallium (Ga)69.723 g/mol, 9.561%

Samarium (Sm)150.36 g/mol, 20.62%

Argon (Ar)39.95 g/mol, 5.479%

Potassium (K × 12)469.176 g/mol, 64.34%

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Elements in this formula

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