On Fri, 13 Jan 2017 13:27:19 -0000, Bod wrote:
On 13/01/2017 11:48, NY wrote:
"The Natural Philosopher" wrote in message
news
On 13/01/17 08:49, NY wrote:
"The Natural Philosopher" wrote in message
news
Why tepid? I run the hottest water I can from the hot tap and fling it
liberally on to the screen. Been doing it for oodles of years with no
problems.
Tim
I pour a just boiled kettle on it
Thermal shock of boiling water on glass that is at around zero degrees.
yes. helps get the ice off
Don't want to crack my windscreen. Also, I'm not sure whether the rubber
of the wiper blades and the surround to the windscreen (between glass
and car body) would withstand boiling water.
I can assure you they all can*, but the water is down at around 20
degrees by the time it reaches them.
*black metal easily reaches 100 degrees in tropical sun.
Ah, maybe I'm being over-cautious, then. What about water at 100 meeting
glass at around 0 - isn't there a risk of the glass cracking? I've heard
of people that it has happened to in this situation.
Probably best to play safe and wait about 30 secs after the kettle
has boiled. by the time you get outside it should be well off of boiling.
Probably 90. I prefer to boil half a kettle, then fill it up from the cold tap. That makes the glass plenty warm enough to stay unfrozen until you've got the car going.
--
There is a big controversy on the Jewish view of when life begins. In Jewish tradition, the foetus is not considered viable until it graduates from law school.