"Roy Smith" wrote in message
...
In article ,
"Tarver Engineering" wrote:

"Roy Smith" wrote in message
...
In article ,
(Andrew Sarangan) wrote:

Carb icing is a totally different fish. What's going on inside a
carburator is liquid gasoline is evaporating and turning into vapor.
There's a phase change. It takes a huge amount of energy to effect a
phase change.

A phase change is involved in the discussion at hand, but the collapse
of
water's "hydrogen bridge" makes the energy involved in a gasoline phase
change look like nothing.



Not sure what you mean by "hydrogen bridge". I'm certainly familiar
with hydrogen bonds, and heats of vaporization and fusion, and the
energy involved in surface tension, but not the term "hydrogen bridge".
Can you explain?

Liquid water tends to have both hydrogen atoms on the same side of the
molecule; 60 degress apart IIRC. The phase change from liquid to soild
water causes the hydrogen attoms to be 180 degrees apart and the molecule to
become larger. There is a specific amount of energy expelled for each
molecule to go through this phase change and it is large. This quantum
aspect of the liquid/solid phase change causes icing to be a statistical
process and invalidates the wind tunnel data.