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Using Sieves and Filters

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Sana Musa

on 1 April 2014

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Transcript of Using Sieves and Filters

Using Sieves and Filters
Sieve and sieving
Sieve: A device used to separate the components a mixture,with many visible holes that allow smaller solid pieces and liquid to pass through while blocking the larger solid pieces.
The definition of Filter
Example of filtration
gasoline filter:
on your car, removes particulates from gas

oil filter:
on your car removes particles from your

coffee filter
: keeps beans out of your brew
furnace filter:
collects dust, pet dander etc
charcoal filter:
on your drinking water removes chlorine.

filter bag:
in your vacuum separates particles from air

Examples of sieving in everyday life
Sieving: The process of passing a mechanical mixture through a sieve to separate out the larger pieces of matter
Filter and Filtration
Filter: A device with many small holes that trap solid
Filtration:The process of passing a mechanical mixture through a filter to separate out solid pieces from a liquid or gas
Sieving and filtration
An example of Filteration
Today our topic will be about sieving and filtration. For this project we will explain what a sieve and filter is and show you an example. You will also learn the difference between these two. Hope you enjoy!
Filtration differs from sieving, where separation occurs at a single perforated layer (a sieve). In sieving, particles that are too big to pass through the holes of the sieve are retained (see particle size distribution). In filtration, a multilayer lattice retains those particles that are unable to follow the tortuous channels of the filter. Oversize particles may form a cake layer on top of the filter and may also block the filter lattice, preventing the fluid phase from crossing the filter (blinding). Commercially, the term filter is applied to membranes where the separation lattice is so thin that the surface becomes the main zone of particle separation, even though these products might be described as sieves.
One of the most common examples of a kitchen sieve is the everyday colander. Colanders have a body that is perforated with a series of uniform holes. It is possible to use the colander to separate solid foods from liquids with relative ease. The device is also used to wash raw fruits and vegetables by placing the food in the colander, then running water over the food. As the water washes over the food, it picks up tiny contaminants and carries them away from the raw foods by expelling the water and the contaminants through the perforations.

The flour sifter is another example of a sieve used routinely in the kitchen. It makes it possible to sift flour so that only the finest flour particles are used in baking. Most flour sifters are equipped with some type of beaters that help to pulverize the larger particles, making them usable in the baking process.

The Difference between sieves and filters
More Examples of Sieving
A sieve may be created using just about any type of material. Some are composed of stainless steel bodies that are perforated with a series of holes to allow sifting to take place. Others are composed with the use of mesh, an approach that is often used when there is a need to finely sift different products. Today, many simple ones are constructed with different types of plastic, or a combination of lightweight metals and plastic to create a sieve that is easy to clean as well as to use.

Most types of kitchen sieves can be purchased at discount retail stores as well as kitchen shops. Industrial versions are available directly from manufacturers as well as from building and industry supply vendors.
A kitchen colander drains excess water from hot pasta, freshly washed greens, and other foods requiring preparation that requires immersion in liquid.
Sieves have wide application in industry.
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