Questions of Heat Transfer in Nature: Large-Scale Phenomena - Questions at the end of the chapter - Chapter 7 Class 7 - Heat Transfer in Nature (Curiosity)

Last updated at May 3, 2026 by

Q5 (Medium): Explain why sea breezes blow toward the land during the day.

Answer:
We have studied that unequal heating creates convection currents in large-scale phenomena . This is why sea breezes form:

  • Land heats faster than sea during day
  • Hot air over land rises upward
  • Cool air from sea moves in
Sea Breeze Formation Step 1 - Land heats up Sun heats land faster than sea Step 2 - Hot air rises Warm air over land goes up Step 3 - Cool air moves Sea air flows toward land Sea breeze blows inland!

Q10 (Medium): How do hot air balloons work? Which mode of heat transfer is involved?

Answer:
We have studied that heated air becomes lighter and rises through convection . This is how balloons work:

  • Burner heats air inside balloon envelope
  • Hot air becomes less dense than outside
  • Convection makes balloon rise upward naturally
Hot Air Balloon Working Step 1 - Heat air Burner heats air inside balloon Step 2 - Air expands Hot air becomes less dense Step 3 - Balloon rises Convection lifts balloon upward Balloon flies by convection!
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