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Lesson: Chapter 9 — Heat

9.5. Heat transfer and conduction 1 of 3

Three ways heat travels

Hold a metal spoon in hot tea and its end slowly warms; hold your hand above a fire and it warms. Heat moving from one place to another is heat transfer.

Figure to be added

Figures 9.24 and 9.25 — a metal spoon in a cup of hot tea, and hands held above a fire.

Heat moves from a hotter place to a cooler one. The heat energy of an object is really the kinetic energy of its randomly moving particles — their translational, rotational or vibrational motion — and heat transfer is that kinetic energy spreading from where the particles move faster to where they move slower.

Conduction

Through a material, particle to particle.

Convection

By a heated liquid or gas rising.

Radiation

As electromagnetic waves, needing no material.