Which term refers to heat transfer that can occur without matter, such as heat from the Sun?

Which term refers to heat transfer that can occur without matter, such as heat from the Sun?

• A. Radiation
• B. Reflection
• C. Conduction
• D. Convection

Answer: (A)

Heat moving through space without any matter is radiation. It transfers energy as electromagnetic waves, so no medium is needed. The Sun warms Earth by this kind of heat traveling through the vacuum of space. Conduction needs contact between particles, like a metal spoon getting hot from a hot stove, and convection requires a moving fluid to carry heat. Reflection is just bouncing light and isn’t a mechanism to transfer heat. Because radiation can move heat across empty space, it’s the best explanation for heat from the Sun.

Heat moving through space without any matter is radiation. It transfers energy as electromagnetic waves, so no medium is needed. The Sun warms Earth by this kind of heat traveling through the vacuum of space. Conduction needs contact between particles, like a metal spoon getting hot from a hot stove, and convection requires a moving fluid to carry heat. Reflection is just bouncing light and isn’t a mechanism to transfer heat. Because radiation can move heat across empty space, it’s the best explanation for heat from the Sun.