Hello All,

As it's Christmas, I've had plenty of time on my hands! Here's a why is
it puzzle!

Why does water vapour condense at the bottom of a window pane first, and
then climb up the window.

Surely if the window is cold, then water vapour should condense on all
the window at the same time?

I thought maybe it's because with a upstairs window, the top of the pane
is by the eves, so warmer. Though that doesn't explain about downstairs
window.

I can see that there's 3 events that could effect condensation on windows:

1) The direction the window is facing, as north facing windows are more
prone to condensation.

2) The air that circulate around a house.

3) Actual properties of the glass is such that when it's in a vertical
position, it's colder at the bottom than the top.

Perhaps I should start another uni project !

Joe
Wolverhampton