Heat Transfer and Conduction Flashcards

A metal rod is heated at one end. Heat travels to the cool end through which process?

Answer: Conduction

Conduction is the transfer of heat through direct contact within a solid material.

Which material would conduct heat the LEAST effectively?

Answer: Wooden handle

Wood is a poor thermal conductor (insulator), while metals conduct heat readily.

Two identical rods—one copper, one iron—are heated at one end equally. Which rod gets hot faster at the far end?

Answer: Copper, because it has higher thermal conductivity

Copper has a much higher thermal conductivity than iron, so heat travels through it faster.

A mechanic wraps a pipe in foam insulation. The foam primarily reduces heat loss by:

Answer: Slowing conduction through its low thermal conductivity

Foam has very low thermal conductivity, which slows the rate of heat conduction to the surroundings.

If you double the thickness of insulation on a pipe, the heat conducted through it will:

Answer: Decrease by roughly half

Heat conduction rate is inversely proportional to thickness; doubling thickness roughly halves heat flow.

A blacksmith's iron tongs feel hot after gripping a heated piece of metal. This is an example of:

Answer: Conduction through direct contact

Heat transferred from the hot metal directly into the tongs through contact is conduction.

Which shape of metal fin on a heat sink would dissipate heat most effectively?

Answer: Thin tall fins with large surface area

Thin, tall fins maximize surface area, allowing more heat to conduct out and radiate or convect away.