How useful the ice field of the refrigerator

the ice field of the refrigerator
To create the ice box at the top of the refrigerator because want to keep circulating of air in the refrigerator regularly. We already know that the air in the refrigerator is heavier than warm air. So when the air above warmer than, It will float up. When effects cooling at the ice box then it will cool down and float down to the lower part. The air will flow evenly and so on, causing temperature inside the refrigerator stable. If create the ice box at the lower part then the cold will not float up and the air in the upper part, which is warmer than it not down to the lower part. Therefore, it is necessary to create the ice box at the top of the refrigerator.