In article , Chewbacca
scribeth thus
tony sayer wrote:
In article , Dave Plowman (News)
scribeth thus
In article ,
Bill wrote:
There is, of course the ancillary question about why, if it's a
condensing boiler, we see so much 'steam' from it. If it were condensing
fully, surely we should see no visible exhaust.
It's water vapour - not steam.

Woss the difference then?...

Steam is a gas and invisible. You can sometimes not see it - as it is
invisible - a mm or 2 above the kettle spout when boiling hard. Above
this you see the foggy stuff we all call steam. Actually this is tiny
particles of liquid water - the steam has condensed as water droplets -
that are so small they float about in the air. Being hot water they
tend to evaporate and disappear.

You tell that to anyone who drives a kettle
--
Tony Sayer