Volatile oil
Fixed Oil
Also called as an essential oil. Also called as natural non-volatile oil.
Volatile oil can evaporate when placed under room
temperature Fixed oils do not evaporate at room temperature
They can be extracted easily by the distillation
process
They require some specific techniques for
extraction.
There is no spot (no permanent stain) left after
evaporation
Some type of spot (permanent stain) left after
evaporation
They are unable to undergo saponification Fixed oils can be easily sponified.
Mixtures of cleoptenes & stearoptenes are termed as
volatile oils
Esters of higher fatty acids & glycerin are called as
fixed oils.
Posses high refractive index Posses low refractive index
These are optically active. These are optically inactive.
Their primary source is leaves,roots,in petals and
bark. Their major source is seeds of the plant.
These are optically active. These are optically inactive.
