A student heats a beaker of water using a Bunsen burner placed under the beaker. The student says that the water is heated by a combination of conduction, c...
Question 1 Report
A student heats a beaker of water using a Bunsen burner placed under the beaker. The student says that the water is heated by a combination of conduction, convection and radiation. Which statement correctly identifies the roles of each method?
Answer Details
This question tests identifying the role of each heat transfer method in heating water with a Bunsen burner.
- Radiation from the flame heats the beaker base (the flame emits infrared and visible light that travels across the air gap to the glass).
- Conduction transfers energy through the solid glass of the beaker base (particles in the glass pass vibrations from the hot outer surface to the inner surface touching the water).
- Convection circulates the water: heated water at the bottom expands, becomes less dense, and rises; cooler water sinks to replace it, creating a convection current that distributes heat throughout.
Conduction through water itself is very slow; it is convection that is responsible for circulating and uniformly heating the water.
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