12.28. Explain, why an organic liquid vaporises at a temperature below its boiling point in its steam distillation ?
In steam distillation, Organic liquid starts boiling when the total sum of the vapour pressure of an organic liquid (P') and the of water (P'') becomes equal to the atmospheric pressure (P),
it means P = P' + P''. since P'< P'', the organic liquid will vaporise at a lower temperature than its boiling point.