Video title: Sieving
How do fishermen try to make sure they only catch adult fish and leave the young behind?
It’s thanks to their net.
The holes allow younger, smaller fish to escape while keeping the big, usually older fish inside.
A net is a type of sieve.
A sieve separates solids that are different sizes.
sieve
separates solids of different sizes
Sieving has many different uses.
Sieves can be small and handheld like those found in kitchens.
When the sieve is shaken, smaller particles of flour fall through the holes in the mesh…
And larger lumps stay in the sieve.
Some farmers also use handheld sieves to separate grains from wheat.
Sieving can be repeated with different mesh sizes to separate more than two solids in a mixture.
For example, in this mixture there are three different sized solids.
This sieve, with a small mesh, will only allow the smallest particles to fall through.
A sieve with a larger mesh can then separate out the medium and larger sized particles.
So it’s the size of the mesh that determines which solids are separated.
mesh size
determines which solids are separated
And if the sieve is a net, the mesh size determines the size of fish that can escape from the fishermen.
Sieving separates solids of different sizes.
Discover the many applications of sieves to separate different solids.
Learning points
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