Water is heated with immersion heater in open condition in a room. Heat losses from the top of the pan to air is to be calculated. And basically three mechanisms of heat transfer by convection, evaporation and radiation is associated with it. (Conduction through walls negligible, insulated from sides). Can the following combinations be considered:
1. Both convection and evaporation along with radiation.
2. Only evaporation and radiation.
3. Only convection and radiation.
Heating of an object results in heat transfer from the material. This heat transfer is due to the result of conduction, convection, and radiation. Conduction is the heat transfer which comes into play only by the contact of the materials.
Answer and Explanation:
When the water is heated by immersing the heater in an open conditioned room, heat losses from the top of the pan to air is occurred by convection and radiation. Convection occurs due to the movement of the heat from the water in the pan to the surrounding air, and the radiation is occurred due to the increase in temperature of the water present in the pan here heat energy is radiated to the air, but the evaporation will not occur since the surface area of the pan consisting of water is small.
Hence the option 3 is correct the answer.
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Learn more about this topic:
from High School Physics: Help and ReviewChapter 17 / Lesson 12