2 Updrafts carry the particles into the cloud where water vapour condenses to form droplets
1 Aircraft release tiny particles of potassium chloride and sodium chloride beneath the base of the cloud
3 Cloud droplets grow in size and collide with each other eventually reaching raindrop size and falling from the cloud
Water vapour condenses
on to particles
Updrafts
3 Cloud droplets grow in size and collide with each other eventually reaching raindrop size and falling from the cloud
2 Updrafts carry the particles into the cloud where water vapour condenses to form droplets
1 Aircraft release tiny particles of potassium chloride and sodium chloride beneath the base of the cloud