"Rod" wrote in message
...
BigWallop wrote:


But it's heat that is hotter than standing on the sun for just a second
or
two (unless it's night time of course), and the pressure front, although
over a short distance, carries a vacuum behind it. When the low but
sustained pressure front hits an object, it first blows it forward.
Then a
bloody great vacuum cleaner comes along at the back of the blower and
sucks
the object up into the air. And it does all that in a few seconds while
it's microwave cooking everything else.

Ouch !!! :-)


If it is very hot that matters, just have a look at sonoluminescence:

http://en.wikipedia.org/wiki/Sonoluminescence

Rod


Is that the thing that high speed boat propellers have to deal with? If the
propeller moves through the water at a certain speed and frequency, you can
see those little lights sparking off them.