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Why must we put food in refrigerator?

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Food is put in refrigerator to prevent it from spoilage by the action of microbes. Rerrigeration at 5oC retards microbial growth, although with extended storage, microorganisms eventually grow and produce spoilage. Slow microbial growth at temprature below -10oC has been described, particularly with fruit juices concentrates, ice cream, and some fruits. Some microorganism are very sensitive to cold and their numbers are reduced. Thus although refrigration slows down the metabolic activity of most microbes, it does not lead to significant decrease in overall microbial populations. Still refrigeration is a convinent and popular way of store and preserving food.
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Why is not acceptable to put hot foods in the refrigerator?

Placing hot food inside a fridge means that the motor has to start  up and keep running until the temperature returns to normal. Also,  food close to the hot food may become