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Questions and Answers
What process primarily involves the transfer of heat through direct contact in solids?
What process primarily involves the transfer of heat through direct contact in solids?
- Radiation
- Conduction (correct)
- Insulation
- Convection
Which type of materials are considered good insulators?
Which type of materials are considered good insulators?
- Metals
- Copper
- Fiberglass wool (correct)
- Water
What occurs in a substance when heat energy causes particles to move faster and further apart?
What occurs in a substance when heat energy causes particles to move faster and further apart?
- Convection (correct)
- Expansion
- Conduction
- Radiation
Which statement accurately describes radiation?
Which statement accurately describes radiation?
What is the primary reason metals are considered good conductors of heat?
What is the primary reason metals are considered good conductors of heat?
How does a larger temperature difference affect the rate of heat transfer?
How does a larger temperature difference affect the rate of heat transfer?
What is the purpose of cavity wall insulation?
What is the purpose of cavity wall insulation?
What is the formula used to calculate payback time for insulation methods?
What is the formula used to calculate payback time for insulation methods?
Flashcards
Conduction
Conduction
Heat transfer through direct contact, primarily in solids.
Convection
Convection
Heat transfer in fluids (liquids and gases) due to density differences.
Insulation
Insulation
Materials that reduce heat transfer (conduction, convection) by creating barriers.
Radiation
Radiation
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Payback Time (Insulation)
Payback Time (Insulation)
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Temperature Difference
Temperature Difference
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Heat Transfer
Heat Transfer
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Good Conductor of Heat
Good Conductor of Heat
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Study Notes
Heat Transfer
- Heat always transfers from hot to cold
- The rate of heat transfer depends on the material (solid, liquid, gas, or vacuum) and the difference in temperature
Conduction
- Occurs in solids
- Heat energy causes particles to vibrate more
- Energy is transferred from one particle to another as they collide
- Metals are good conductors because they have free electrons that quickly move energy from hot to cold
Convection
- Occurs in liquids and gases
- Heat energy causes particles to move faster and further apart
- This creates less dense particles that rise
- Denser particles sink
- This creates convection currents
Radiation
- All warm objects emit heat radiation in the form of infrared waves
- Hotter objects emit more radiation than colder ones
- Radiation can travel through solids, liquids, gases, and a vacuum
- Black surfaces absorb radiation best
- Shiny surfaces reflect radiation best
Insulation
- Air is a poor conductor because of the gaps between particles
- Loft insulation (fibreglass wool) reduces conduction by trapping air
- Double glazed windows reduce conduction by trapping air between layers of glass
- Stopping draughts reduces convection currents by preventing cold air from entering and hot air from escaping
- Floor insulation (fibreglass wool) reduces conduction by trapping air
- Cavity walls reduce conduction by trapping air between layers of bricks
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