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Difficulty: EasyHeat Transfer: Conduction

While welding a steel bracket, a fabricator notices that the heat travels along the length of the solid metal, eventually making the opposite unheated end too hot to handle. Which mechanism is primarily responsible for transferring heat through this solid metal component?

  1. ConductionAnswer
  2. B
    Convection
  3. C
    Radiation
  4. D
    Thermal expansion

Answer

Conduction is the correct mechanism for heat transfer through a solid.
Conduction is the physical process where heat energy is transferred through a solid material by direct molecular collision. When the torch heats one end of the steel bracket, the energized molecules vibrate and pass the heat energy to adjacent molecules all the way down the metal.

Step-by-Step Solution

1
Analyze the physical state of the medium transferring the heat in the scenario.
The heat is moving through a 'solid metal component' (the steel bracket).
Different modes of heat transfer operate in different mediums (solids, fluids, or vacuums).
2
Identify the heat transfer method associated with solid materials.
Heat transfer within a solid object due to a temperature gradient occurs via direct molecular interaction, which is defined as conduction.
Convection requires a circulating fluid, and radiation does not rely on a solid medium, leaving conduction as the correct process.

Key Concept

Heat Transfer via Conduction
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Topics

Heat Transfer: Conduction

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