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Questions and Answers
What is the primary mechanism of heat transfer through direct contact between particles of a substance?
What is the primary mechanism of heat transfer through direct contact between particles of a substance?
- Conduction (correct)
- Vibration
- Radiation
- Convection
Which type of material is generally an excellent conductor of heat due to the free movement of electrons within its structure?
Which type of material is generally an excellent conductor of heat due to the free movement of electrons within its structure?
- Metal (correct)
- Plastic
- Wood
- Glass
Why are non-metallic substances such as wood or plastic often referred to as insulators in the context of heat transfer?
Why are non-metallic substances such as wood or plastic often referred to as insulators in the context of heat transfer?
- They contain free delocalized electrons
- They have high thermal conductivity
- They are excellent conductors of heat
- Their particles are not free to move and transfer energy efficiently (correct)
Which mechanism of heat transfer involves the movement of heated liquid or gas within a fluid or gas?
Which mechanism of heat transfer involves the movement of heated liquid or gas within a fluid or gas?
What type of heat transfer can occur in a vacuum without the need for a medium?
What type of heat transfer can occur in a vacuum without the need for a medium?
What is the primary mechanism of heat transfer through the movement of a fluid?
What is the primary mechanism of heat transfer through the movement of a fluid?
Which heat transfer mechanism does not require a medium to transfer heat?
Which heat transfer mechanism does not require a medium to transfer heat?
In the context of heat transfer, what happens when a fluid is heated and becomes less dense?
In the context of heat transfer, what happens when a fluid is heated and becomes less dense?
Which heat transfer mechanism is crucial in shaping weather patterns and ocean currents?
Which heat transfer mechanism is crucial in shaping weather patterns and ocean currents?
In which scenario is radiation the primary mechanism of heat transfer?
In which scenario is radiation the primary mechanism of heat transfer?
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Study Notes
- Conduction is the transfer of heat through particles colliding with each other.
- Solids are the best conductors as their particles are close together and collide frequently.
- Glass, a typical solid, conducts heat through particles vibrating and colliding, but not as efficiently as metals.
- Metals conduct heat more efficiently due to the presence of free delocalized electrons.
- Electrons in metals can transfer heat rapidly by bumping into atoms throughout the metal.
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