Bleeding radiator question

[Terry Casey]

I've never seen a precise figure but 34'[1] is the figure that springs to mind, so not a bad approximation.

[1]Another approxomation I recall is the height of the ridge of the roof of a two storey house - no idea how accurate (or otherwise) that is, though.

[nothanks]

Although this is a bit academic, it might be of general interest to someone. The International Standard Atmosphere defines sea level pressure as 1013.25 hPa; in the bottom part of the atmosphere, this decreases by approximately 1 hPa every 30 feet. The real-world sea-level pressure varies daily between (very roughly) min and max of 980 and 1040 hPa, so that's between about 32.8 and 34.8 feet of water. Here endeth the lesson ;-)

[Roger Hayter]

Is that using metric water?

[John Rumm]

Yup ;-)

(now recompute for heavy water!)

[Vir Campestris]

Hectopascals? really?

This is the first time I've ever seen them used.

Andy

[nothanks]

Yup! It used to be millibars, but that became too familiar so it changed to hPa - even units get rebranded :-)

[Vir Campestris]

I've seen Pascals and kPa many times. It's the hecto that surprised me.

Andy