Daily Archives: July 8, 2015

Rainmaking is not easy. Cloud droplets are usually 10 times smaller than the periods in this article, and a single, small raindrop is a collection of about 1 million of them. To form rain, we need a mechanism to collect these cloud droplets.

One process to produce a large drop quickly is to combine many smaller particles. To do this, the cloud particles have to bump into each other and merge together, or coalesce. This is called the collision-coalescence process. Continue reading →