PRESENTATION OUTLINE
SEPERATING INSOLUBLE SUBSTANCES
🍇Gravity seperation🍇
Gravity separation uses
gravity to separate heavier substances from the lighter ones. The heavier particles sink to the bottom of
the container because they are heavier.
An example for gravity separation is panning for gold. They gold sinks to the bottom while the other substance stays on top.
🍓Sieving🍓
A sieve is a basically a bowl with holes in it. Small solid particles
can get through, but large ones cannot.
An example for sieving is in flour there can be large lumps, these lumps can be removed before baking by sifting the
flour through a flour sifter.
🍒Filtration🍒
Filtration, also known as filtering, is a mainly used for separating solids from gases, solids from liquids, liquids from gases and liquids from other liquids.
Filtration uses a filter. This acts like a sieve to separate
insoluble substances. These holes are smaller than the particles being separated and so these particles get caught in the filter. But the smaller particles will pass straight through. Many filters are a mesh of fine fibres like cotton wool, while others
are like rock with fine pores in it.
An example for filtration is tea bags. They are a type of filter that allows
water to move through them while keeping the tea leaves in the bag.
