Understanding Heat Transfer

What is conduction in heat transfer?

• Conduction is the transfer of heat through radiation.

• Conduction occurs when heat is transferred through fluids.

• Conduction is the movement of heat through the air without contact.

• Conduction is the transfer of heat through direct contact between materials.

How does convection differ from conduction?

• Convection involves fluid movement, while conduction is heat transfer through direct contact.

• Convection requires a vacuum, while conduction can occur in any medium.

• Convection is the transfer of heat through radiation, while conduction is through fluids.

• Convection occurs only in solids, while conduction occurs in liquids.

What is an example of radiation in everyday life?

• Electricity

• Magnetism

• Sound waves

• Sunlight

What happens to the temperature of an object when it absorbs heat?

• The temperature of the object decreases.

• The temperature of the object remains the same.

• The temperature of the object fluctuates randomly.

• The temperature of the object increases.

Define specific heat capacity.

• Specific heat capacity is the amount of heat lost by a substance when it cools down.

• Specific heat capacity is the total energy contained in a substance.

• Specific heat capacity is the heat required to raise the temperature of one unit mass of a substance by one degree Celsius.

• Specific heat capacity is the temperature at which a substance changes state.

What materials are good conductors of heat?

• Wood

• Copper, aluminum, silver

• Rubber

• Plastic

How does the process of convection occur in liquids?

• Convection involves the mixing of liquids without any temperature change.

• Convection occurs only in gases, not in liquids.

• Convection is the process of heat transfer through direct contact between molecules.

• Convection occurs through the movement of warmer, less dense liquid rising and cooler, denser liquid sinking, creating a circulation pattern.

What is the role of thermal radiation in heating?

• Thermal radiation cools down objects by absorbing heat.

• Thermal radiation is a process that requires direct contact between objects.

• Thermal radiation transfers heat energy through electromagnetic waves, increasing the temperature of objects that absorb it.

• Thermal radiation only affects gases and not solids or liquids.

Explain how heat transfer occurs in a vacuum.

• Heat transfer in a vacuum occurs through conduction.

• Heat transfer in a vacuum occurs through radiation.

• Heat transfer in a vacuum occurs through convection.

• Heat transfer in a vacuum is impossible and does not occur.

What is the formula for calculating heat transfer?

• Q = mΔT

• Q = mc^2

• Q = mcΔT

• Q = m/(cΔT)