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From: prd@pauldormer.cix.co.uk (Paul Dormer)
Newsgroups: rec.arts.sf.fandom
Subject: Re: Household Algebra
Date: Fri, 3 May 2024 11:17 +0100 (BST)
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In article <v10ou0$kmp$1@panix2.panix.com>, kludge@panix.com (Scott
Dorsey) wrote:

> Just what IS gas mark five anyway?

Serious answer: 191 C (375 F)

https://en.wikipedia.org/wiki/Gas_mark

Interestingly, that article refers to gas regulo, which was the term I
remember growing up.  I didn't know it came from an early type of
regulated oven.

I remember school science text books back in the sixties having diagrams
of gas oven thermostats.  I can't find it online but as I recall, it had
a metal rod that expanded as the temperature increased, shutting off the
gas flow.  (I haven't had a gas oven for years.)