Clouds & Particles

Clouds & Particles
1. What happens in clouds?
Solution Worksheet 3
Convection currents in the pool of melted wax in a candle appear because
the wax is hottest closest to the wick. The wax rises to the surface at the
wick, travels across the surface to the edge of the candle, cooling down as it
goes and then sinks to the bottom of the pool of wax at the edge. This
circulation forms "convection cells".
A lift typically ascends at about 2 m s-1.
Gliders and aircraft have to be very careful of cumulonimbus clouds because
of their strong vertical air currents. For this reason, pilots are given
particular warnings from the local airport weather service when there are
cumulonimbus clouds around.