On 27/06/2019 11:37, Andrew wrote:
On 27/06/2019 10:49, The Natural Philosopher wrote:
That is 50C is the difference in length of a mercury column half way
beytween the boiling pintÂ* at seal level, and 1000mb, and the
freezxing point of water.

Tide, IN, OUT or midway though ?.

The seals dont care as long as the pints are boiling.:-)

Midway of course. We were very good at mean sea level, being seafarers,
back in the 1800s

Remember mercury barometers and mercury thermometers allowed all these
things to be tied together.




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