A sieve, fine mesh strainer, or sift, is a tool used for separating wanted elements from unwanted material or for controlling the particle size distribution of a sample, using a screen such as a woven mesh or net or perforated sheet material.
In cooking, a sifter is used to separate and break up clumps in dry ingredients such as flour, as well as to aerate and combine them.
A strainer (see Colander), meanwhile, is a form of sieve used to separate suspended solids from a liquid by filtration.
Coarse particles are separated or broken up by grinding against one another and the screen openings.
[4] A sieve analysis (or gradation test) is a practice or procedure used (commonly used in civil engineering or sedimentology) to assess the particle size distribution (also called gradation) of a granular material.