Thread: A very simple question..

Why a convection will spins the spiral cardboard??? :?

Sorry, but you're going to have to try that again. What you said doesn't mean anything by itself.

I am guessing that James has a piece of cardboard cut in a spiral pattern and suspended from a thread so that it hangs down as a helix. Below it he places a heat source that generates convection current in the air.
If such is the case, then the answer to this homework exercise is.........
Well James, what do you think the answer might be? Any guesses at all as to what is involved?

is it means like what would happen is air flowing from down to up in center of heat?