What Does 'Filtering' Mean In Science?


4 Answers

Florent Lefortier Profile
In chemistry, a filter is a porous material that is used to separate one thing from another. 

How Does A Filter Work?
I’ll use coffee filters as an example, as they’re pretty much identical to the filters you use in science class – the chemistry filters are just thicker and stronger.

If you pour a mixture of ground coffee and hot water into a coffee filter, the liquid will pass through the paper, and all the solids will collect in the filter. You’ll then have the pure liquid that you want (the coffee-infused water) without all the junk that you don’t (floating bits of powdered coffee bean).

This is exactly what scientific filtering does; it separates a solid from a liquid. Some advanced filters are also used to remove impurities from a liquid. 

What Other Types Of Filter Are There?

You can get some more advanced filters in different branches of science, including:

  • Electrical filters - these let some frequencies pass through and not others. These are used in radios, so you can tune-in to one particular station without all the other frequencies interfering.
  • Optical filters (pictured) - these filter light, letting some colors through and not others. These are often used in photography.
xiao guguai Profile
xiao guguai answered
Filter is an object or piece of equipment that allows you to remove substances that are not wanted from a liquid or gas.
Shobhit  Scanf Profile
Shobhit Scanf , 5 Years of experience in industrial equipment, answered
In school, we learned that filtering means to drain out unwanted substances, and there are many steps to apply.

Anonymous Profile
Anonymous answered
Getting rid of stuff you don't want.

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