write about the Closed system :
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a cup containing hot coffee is covered with a saucer. Coffee cools down by giving away heat to the surroundings. The water vapour from coffee now does not pass into surroundings. Such a system that exchanges energy and not the matter with the surroundings is called a closed system.
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A closed system is one that cannot transfer energy to its surroundings. Biological organisms are open systems. Energy is exchanged between them and their surroundings, as they consume energy-storing molecules and release energy to the environment by doing work.
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