please help and answer it
Answers
Answer:
a) Because of low thermal conductivity of gunny bags. Air is filled in pores of gunny bag which acts as insulator.
b) Because of anomalous property of water, a thick lauer of ice is formed on pond surface first which protects fishes.
c) Freezing chest in a refrigerator is fitted near its top, because it cools the remaining space of the refrigerator by convection current. Air near the top comes in contract with the freezing chest gets cooled, becomes denser and therefore descends while the hot air from the lower part rises and hence convection currents produced cool the whole space inside.
Answer:
a) in summer ice is kept in a gunny bag because ice is melt due to air in the atmosphere
b) fishes survive in ponds even when the atmospheric temperature is below 0 degree celcius because in the pond, the bottom layer of the water is deep and warm also.so the fishes go into deep in pond
c) freezing chest in a refrigerator is fitted near the top because It cools the remaining space and the cold air in the refrigerator is heavier as the atmospheric cold air is also heavier