Which of these is a method by which some fire extinguishers work?
1 They cut off the oxygen supply to the burning substance.
2 They reflect away the heat because of their colour and thus cool down the burning substance.
3 They exert force on the substance that has caught fire because of which the fire gets extinguished.
4 They release chemicals which react with the oxygen in the air and stop it from reaching the burning substance.
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Explanation:
First option is correct.
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