Learn more physics!
How can you stop convection from happening? And why is trapped air a good insulator?
- nida khan
Walthamstow School For Girls
Convection happens when air moves around, carrying heat from one
place to another. So in order to stop convection from happening, you
just have to get the air to stay still. Warm air will rise relative to
cold air even when nothing else is moving it, so keeping air still is
not so easy to do. In double-paned glass windows, for example, air is
trapped between two panes of glass. There is nothing in there to make
the air move, so very little heat can be lost by convection. If we
don't need to see through it, like a wall rather than a window, we can
use fiberglass insulation to keep the air from moving.
(republished on 07/27/06)
Follow-up on this answer.