How do raindrops form?

This is merely a first draft interface mockup of a planned interactive (microworld/simulation). It is not yet functional!

Questions for the scientists/modelers:

• What are the most appropriate/important variables involved in the formation of raindrops? [current model has temperature, humidity, and aerosol concentration]
• Should the raindrops be falling or floating?
• What is the algorithm relating the input parameters to the output (number of raindrops)?
• Should the raindrops be different sizes, or all the same size?
• What range of values should the user be able to assign to each of the parameters?
• What are realistic values for concentrations (per cm³?) of aerosols and raindrops within a typical cloud? What are realistic sizes for aerosols particles and raindrops?