Why does shooting increase clouds and rainfall?

Spread refrigerant (such as dry ice, propane, etc.). ), crystallizer (such as iodide, lead iodide, phloroglucinol,' tetraacetaldehyde', ferrous sulfide, etc. ), hygroscopic agents (salt, urea, calcium chloride) and water mist act on clouds, thus changing the size, distribution and properties of cloud droplets, interfering with airflow, changing buoyancy balance, accelerating its growth process and achieving the purpose of precipitation.