These oils can be extracted by
crushing the plant material,
pressing them between metal plates
and squashing the oil out to be
used for food or fuel. This is the
traditional method for olive oil
Oil can be separated from
crushed plant material by a
centrifuge - like using a spin-dryer
to get water out of wet clothes
solvents are used to get oil from plant material
Distillation refines oil, and removes
water, solvents and impurities