(i) Volatile oils are volatile at room temperature and are usually obtained by distillation. On the other hand fixed oils are not volatile at room temp. so they can only be obtained by special extraction methods
(ii) Volatile oils when evaporated do not leave any spot while fixed oils leave spot after evaporation.
(iii) Volatile oils can not be saponified i.e. can not be turned into soap while fixed oil can be saponified.
(iv) Volatile oils are mixtures of cleoptenes and stearoptenes while fixed oils are esters of higher fatty acids with glycerin.
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