why is heat transfer by Convection possible only in liquids and gas? how are land breeze and sea breeze caused?
Answers
Answer:
In the process of convection, molecules move from a hotter place to a colder region. Therefore, convection is impossible in solids because the molecules are rigid and vibrate when heated. In liquids and gases, molecules are comparatively less rigid and can move easily, thereby making convection possible in them.
Convection is the motion of a fluid driven by the differences in temperature across that fluid. When a fluid is heated, the region closest to the heat source becomes less dense due to increased kinetic energy in the particles. The portion of the less dense fluid then rises, while the denser portion of fluid sinks. The process repeats itself because the less dense fluids cool down as they move away from their heat source, making them sink, while the denser fluids heat up as they near the heat source, making them rise. This creates convection currents.
