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Question in Physics for students of Class 7: a)Explain why the freezing chest of a refrigerator is fitter near the ceiling of the refrigerator? b)The density of mercury is 13600 kg/m3. Express this density in CGS unit.

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AJ Madison Whirlpool Gold GSS30C6EY Side-by-Side Refrigerator - $1,704.60 From the front it's hard to tell a standard-depth from a counter-depth refrigerator. The first clue will be the price tag: Counter-depth ones tend to cost more. Second, check the specs: A standard refrigerator can be 6 inches... read more
AJ Madison Whirlpool Gold GSS30C6EY Side-by-Side Refrigerator - $1,704.60 From the front it's hard to tell a standard-depth from a counter-depth refrigerator. The first clue will be the price tag: Counter-depth ones tend to cost more. Second, check the specs: A standard refrigerator can be 6 inches deeper. If you're looking at this option, consider your circulation path; a standard-depth fridge can really change the flow and design of a kitchen. read less
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12years experience of teaching Maths&Science to students of CBSE & ICSE board student.

Divide 13600 by 1000 and the density of mercury in cgs unit is 13.6 g/cubic centimetres
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Ans(a): As air is the hottest near the ceiling of refrigerator as compared to rest of the places, so sufficient cooling of the air is needed in this region for better performance of the refrigerator. Ans(b): 13.6 gram/cubic centimeter (13600 x 1000 gram/ 100 x100 x 100 c c).
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I am a good teacher of physics,chemistry,maths and biology for school standard

13.6gm/c.c
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it is fitted near the ceiling as air here is hottest as compared to rest of the places, so sufficient cooling of the air here helps in better performance of the refrigerator. 1g/cm3=1000 kg/m3 so, 13600kg/m3= 13.6g/cm3
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Trainer

it is fitted near the ceiling as air here is hottest as compared to rest of the places, so sufficient cooling of the air here helps in better performance of the refrigerator. 1g/cm3=1000 kg/m3 --> so, 13600kg/m3= 13.6g/cm3
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It is because when air inside a refrigerator gets warm its molecules expand. As a result its density decreased . So it becomes lighter in weight. Hence lighter molecules tend to rise upward towards the ceiling of the refrigerator. Since the freezing chest is located at the ceiling of the refrigerator,... read more
It is because when air inside a refrigerator gets warm its molecules expand. As a result its density decreased . So it becomes lighter in weight. Hence lighter molecules tend to rise upward towards the ceiling of the refrigerator. Since the freezing chest is located at the ceiling of the refrigerator, so the warm molecules gets cooled and by convection process it againn comes downwords doe to its density getting denser so its weight increases. This process of cooling continues to keep the refrigerator cool inside. read less
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Teacher

To answer the question on density, you may use the following standard way: The density of mercury is 13600 kg/m3. Express this density in CGS unit. 13600 x 1000 g/(100 cm)^3 = 13600 x 1000 g/(100^3 cm^3) = 13600 x 1000 g/(100x100x100 cm^3) = 13600 x 1000 g/(1000000 cm^3) = 13.6 c/cm^3
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B.Sc. IT

13.6 gm/cm3
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Hot air has lesser density than cold air. So it always rises up. Now the freezer cools it, thus increasing its density and this cold air descends to the lower part On the way down it absorbs the heat from the food items. As it reaches down its temperature increases and again it rises up. This is a very... read more
Hot air has lesser density than cold air. So it always rises up. Now the freezer cools it, thus increasing its density and this cold air descends to the lower part On the way down it absorbs the heat from the food items. As it reaches down its temperature increases and again it rises up. This is a very good example for a convection phenomenon. If the freezer was placed at the bottom of the fridge then this cycle would not occur and cold air would get accumulated in the lower portion of the fridge. This would cause unevenness in the temperature of air inside the fridge and there won't be any circulation. read less
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