Explain the term (a) Flocculation value (b) Gold number

Explanation

.A n:. Clouds are eolliodal systems and consist of water vapours mixed with dust particles. The water molectles present in a cloud devélop soine electrical eharge. Therefore, chotids can be made to rain by neutralising the charge present ori colloidal particles, This type of rain is called artificial rain and may be calried out by spraying oppositely charged colloidat dust or sand particles over a cloud. This neutralises the eharge on.water molecules and eompels them to get congulated ie to rain.