Intro To Heat Transfer, Part 2

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Question 1: Is heat transfer relevant to only one science subject?

• No

• Yes

Answer explanation

No. It's relevant in many such as Earth Sciences and Living Sciences (also chemistry, physics, engineering).

Do people lose heat through thermal radiation?

• No

• Yes

Answer explanation

Yes. All objects lose heat by thermal radiation. We can see some of this heat in very hot objects (e.g., wires in a toaster, the Sun), but warm and cold objects also radiate heat, including people.

Does thermal conduction happen at the same speed for all metals?

• No

• Yes

Answer explanation

No. Some are faster (like copper) and others are slower (like steel).

Will a metal bridge get longer on a hot day?

• No

• Yes

Answer explanation

Yes. But expansion joints in some long metal structures may prevent them from buckling when they expand.

Does thermal expansion affect liquids?

• No

• Yes

Answer explanation

Yes. An example is the volume of liquid in a thermometer.

Does thermal expansion affect gases?

• No

• Yes

Answer explanation

Yes. That's why hot air balloons are inflated by hot air. It's also why canisters can explode if left in a hot car.

For most objects around us, is there one way they gain heat?

• No

• Yes

Answer explanation

No. There are usually 2 or 3 ways (conduction, convection and radiation).

For most objects around us, is there one way they lose heat?

• No

• Yes

Answer explanation

No. There are usually 2 or 3 ways (conduction, convection and radiation).