Heat Transfer Modes Limitations
Understanding how heat moves is key. Conduction and convection are two primary modes of heat transfer. Let's look at their requirements:
- Conduction: Heat transfer through direct contact between particles. It requires a physical medium (solid, liquid, or gas) for particles to collide and transfer energy.
- Convection: Heat transfer through the movement of fluids (liquids or gases). It requires a fluid medium that can circulate, carrying thermal energy with it.
Why Vacuum Prevents Heat Transfer
A vacuum is essentially a space devoid of matter. Since both conduction and convection require a medium:
- In a vacuum, there are no particles to collide (blocking conduction).
- In a vacuum, there is no fluid to move (blocking convection).
Therefore, conduction and convection cannot operate between bodies separated by a vacuum.
Other Options Analysis
The other options represent materials that can act as a medium:
- Aluminium (solid): Allows conduction.
- Ice (solid): Allows conduction. If melting, the resulting water allows conduction and convection.
- Water (liquid): Allows both conduction and convection.
Similar Questions
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- _____ is the unit of thermal conductivity.
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Which of the following options is correct when two objects at the same temperature are kept in contact with each other?
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