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How your home refrigerator work? explain with details. Why freezer we placed on the top, not at the bottom. Why we need a compressor in

How your home refrigerator work? explain with details. Why freezer we placed on the top, not at the bottom. Why we need a compressor in a refrigerator? A similar question is also applicable to Air conditioning.

Question 2>How petrol engine works (Otto cycle)? what will happen when I accelerate the bike or car.

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