I WONDER - What Is Radiation?

Radiation is a unique method of heat transfer that can occur through the vacuum of space, unlike conduction or convection which require a medium. The sun's heat travels millions of miles through space to warm Earth. Similarly, we can feel the warmth of a campfire from a distance without direct contact.

What makes radiation different from other forms of heat transfer?

• It needs a liquid to move through.

• It is slower than conduction.

• It can transfer heat through a vacuum.

• It requires a solid medium.

What is necessary for conduction and convection that radiation does not require?

• A medium like solid, liquid, or gas

• A vacuum

• A source of light

• A magnetic field

How far does the sun's heat travel to reach Earth?

• 9,300 miles

• 93,000 miles

• 930,000 miles

• 93,000,000 miles

Which of the following is an example of feeling radiation?

• Touching a hot stove

• Feeling the warmth of a campfire from a distance

• Using a microwave oven

• Boiling water on a stove

Why can you feel the heat of a campfire without touching it?

• Because of radiation

• Due to convection currents

• Because of conduction

• Due to the fire's color