Question

A refrigerator is almost used in every home. Why?

Answer 1

Refrigerator is a device used for the Refrigeration process. This used to maintain the lower temperature inside the refrigerator. This device provides the optimum temperature for storage of vegetables, fruits, uncooked and cooked food.

Complete Answer:
Refrigerators maintain the low temperature, at this temperature microorganisms become inactive, which prevents the food from decaying. The working of a refrigerator involves removal of heat from one region and its deposition to other
The refrigerator works on the principle of Extraction of heat from the body, this is related to the Second law of thermodynamics. The temperature can be lowered by extracting or removing the heat from the material. The Evaporator present in the Refrigerator makes the refrigerator cold. The evaporator turns from liquid to gas through evaporation inside the refrigerator. This produces a proper environment for storage of foods at home.
Most Bacteria rapidly grow at the temperature of 4 degree Celsius. The temperature maintained in the refrigerator is below 4 degrees Celsius. Refrigeration and freezing are the most common forms of food preservation. Meat, fish, uncooked, precooked foods have limited life because of their enzyme activities, bacterial attack and aging. These types of foods can be stored in refrigerators at low temperatures.

So, in order to prevent food from spoilage, refrigerators are present in almost every home.

Note:
Refrigerators can reduce the rate of deterioration of food. The fresh fruits and vegetables can be stored for a long period of time. The lower temperature present inside the refrigeration slows down the reproduction rate of bacteria, so it reduces the rate of spoilage of foods. Refrigerator does not kill the pathogenic or spoilage organism, it inactivates the organism and their enzyme.