T-Level 2.7 Heat principles

What is the primary mechanism of heat transfer in fluids?

• Conduction

• Convection

• Radiation

• Evaporation

Which law is used to calculate the heat transfer due to conduction?

• Newton's Second Law

• Ohm's Law

• Fourier's Law

• Boyle's Law

What happens to air density when the temperature increases?

• Increases

• Decreases

• Remains constant

• Initially increases, then decreases

What is the relative humidity when the air is fully saturated with water vapor?

• 50%

• 75%

• 100%

• 25%

Which process describes the transformation of gas to liquid?

• Evaporation

• Condensation

• Sublimation

• Deposition

What is the term for the movement of air due to temperature differences?

• Air resistance

• Air conduction

• Air convection

• Air radiation

How does humidity affect air density?

• Increases air density

• Decreases air density

• No effect on air density

• Initially decreases, then increases air density

What is thermal conductivity a measure of?

• The ability of a material to resist heat transfer

• The amount of heat that passes through a material

• The ability of a material to conduct heat

• The temperature difference across a material

What does thermal resistance depend on?

• The material's thickness and thermal conductivity

• The material's color and texture

• The temperature difference across the material

• The material's density and specific heat

In the context of heat transfer, what is a convection cycle primarily driven by?

• Magnetic fields

• Gravity

• Temperature differences

• Electrical fields