Question:
Which part of the domestic refrigerator is the least cold one?
Which part of the domestic refrigerator is the least cold one?
Show Hint
Remember the natural convection gradient in a refrigerator:
- Top Upper shelves \(\rightarrow\) Closest to the evaporator, coldest zone (ideal for dairy/milk).
- Bottom Crisper drawers \(\rightarrow\) Farthest from the evaporator, warmest (least cold) zone (ideal for fresh produce).
- Top Upper shelves \(\rightarrow\) Closest to the evaporator, coldest zone (ideal for dairy/milk).
- Bottom Crisper drawers \(\rightarrow\) Farthest from the evaporator, warmest (least cold) zone (ideal for fresh produce).
Updated On: Jul 23, 2026
- Top of refrigerator cabinet
- Middle of refrigerator cabinet
- Bottom of refrigerator cabinet
- Tray meant for storing milk
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Domestic refrigerators use natural convection to distribute cold air throughout the storage cabinet.
Because cold air is denser than warm air, temperature gradients develop within the fresh food compartment based on the position of the cooling coils or evaporator.
Step 2: Detailed Explanation:
Let us analyze the temperature distribution in a standard domestic refrigerator:
- The cooling source (evaporator or cold air duct) is located at the top of the fresh food compartment.
- Cold air cools near this source, becomes denser, and naturally sinks toward the bottom of the cabinet.
- As this cold air descends, it absorbs heat from the food items and the cabinet walls, slowly warming up.
- The warmed air becomes less dense and rises back toward the top to be cooled again, creating a continuous natural convection current.
- Because of this convective flow, the coldest areas are near the top shelves and the milk storage tray, which are closest to the cooling source (maintaining temperatures of 1.5°C to 3°C).
- The middle shelves maintain moderate temperatures of approximately 4°C to 5°C.
- The bottom of the refrigerator cabinet, where the crisper drawers are located, is the farthest from the cold air source.
- The air has warmed significantly by the time it reaches this area, making the bottom of the cabinet the warmest (least cold) part of the refrigerator (maintaining temperatures of 7°C to 10°C).
This warmer temperature is ideal for storing fruits and vegetables, preventing them from suffering chilling injury.
Step 3: Final Answer:
The least cold part of a domestic refrigerator is the bottom of the cabinet.
Domestic refrigerators use natural convection to distribute cold air throughout the storage cabinet.
Because cold air is denser than warm air, temperature gradients develop within the fresh food compartment based on the position of the cooling coils or evaporator.
Step 2: Detailed Explanation:
Let us analyze the temperature distribution in a standard domestic refrigerator:
- The cooling source (evaporator or cold air duct) is located at the top of the fresh food compartment.
- Cold air cools near this source, becomes denser, and naturally sinks toward the bottom of the cabinet.
- As this cold air descends, it absorbs heat from the food items and the cabinet walls, slowly warming up.
- The warmed air becomes less dense and rises back toward the top to be cooled again, creating a continuous natural convection current.
- Because of this convective flow, the coldest areas are near the top shelves and the milk storage tray, which are closest to the cooling source (maintaining temperatures of 1.5°C to 3°C).
- The middle shelves maintain moderate temperatures of approximately 4°C to 5°C.
- The bottom of the refrigerator cabinet, where the crisper drawers are located, is the farthest from the cold air source.
- The air has warmed significantly by the time it reaches this area, making the bottom of the cabinet the warmest (least cold) part of the refrigerator (maintaining temperatures of 7°C to 10°C).
This warmer temperature is ideal for storing fruits and vegetables, preventing them from suffering chilling injury.
Step 3: Final Answer:
The least cold part of a domestic refrigerator is the bottom of the cabinet.
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