The fundamental reason of having a refrigerator is that to keep the food items and the stuff to remain cool for a longer time and to keep the food fresh without spoilage for the longer time , mainly the cool temperature helps to stay the food for the longer time , the main reason of having a refrigerator is that to slow down the activity of bacteria so that it takes the bacteria for the longer time to spoil the food , in our daily life if we see that the bacteria will spoil the milk within 3 hours if the milk is left out on the kitchen counter at the room temperature.

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