Here's why:
* Ice Nucleation: Silver iodide has a crystal structure very similar to ice, allowing it to act as an effective ice nucleus. When dispersed into clouds, silver iodide particles serve as a template for water molecules to freeze onto, even at temperatures slightly above freezing.
* Cloud Seeding: By introducing silver iodide into clouds, rainmakers aim to enhance the formation of ice crystals, which then grow larger and eventually fall as rain.
Other materials used:
* Dry ice (solid carbon dioxide): Dry ice is also effective in creating ice nuclei, but it is less efficient than silver iodide.
* Sodium chloride (table salt): While less common, sodium chloride can also act as a condensation nucleus.
Note: The use of silver iodide in rainmaking is a controversial topic. While it is considered generally safe, there are concerns about potential environmental impacts.
