Is silver iodide used as a cloud seeding agent in warm or cold clouds? Why is it the most commonly used cloud seeding agent?
What will be an ideal response?
ANSWER: Cloud seeding has been attempted in both cold and warm clouds.
Silver iodide has a crystalline structure similar to an ice crystal, which is why it acts as an effective ice nucleus at temperatures of -4°C (25°F) and lower. Silver iodide causes ice crystals to form in two primary ways:
1) Ice crystals form when silver iodide crystals come in contact with supercooled liquid droplets.
2) Ice crystals grow in size as water vapor is deposited onto the silver iodide crystal.
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Silver iodide is much easier to handle than dry ice, since it can be supplied to the cloud from burners located either on the ground or on the wing of a small aircraft. Although other substances, such as lead iodide and cupric sulfide, are also effective ice nuclei, silver iodide still remains the most commonly used substance in cloud-seeding projects.
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