What do you observe on the filter paper strip after 2 to 3 hours?

Filtration

Filtration is commonly used to separate heterogeneous mixtures in liquid form. It separates solid particles from the liquid. The diagram shows how a filter holds back bigger solid particles while the liquid passes through.

Bigger solids can be separated from water by passing the mixture through a paper filter or a finely woven cloth. Ancient techniques for purifying water include filtering it through clean, fine sand or fine coal powder.

assuming you are in the home page.

1) go to the upper right hand corner

2) click on your "profile picture"

3) go down to "edit profile"

4) it should be titled as "edit your profile", click on "profile picture"

5) choose a file

6) press "change"

you're profile picture is updated

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