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The video tutorial explains the concept of using nets and sieves to separate items based on size. It begins with a discussion on fishing techniques that allow young fish to escape while retaining larger fish. The tutorial then introduces sieves, describing their function in separating solids of different sizes. Various applications of sieves are covered, including their use in kitchens and farming. The video details how sieves work by allowing smaller particles to pass through while retaining larger ones, and concludes with an explanation of how the size of a net or grid determines what can pass through.

What is the purpose of the network of holes mentioned in the text?

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What happens to the smallest particles when the sieve is shaken?

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Explain the process of using hand sieves to separate wheat grains.

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How does the size of the sieve's grid affect the separation of solids?

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Describe the relationship between the size of the net and the size of the fish that can escape.

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