Question 1

How does heat transfer by conduction differ from convection?

Accepted Answer

Conduction transfers energy through a temperature gradient without bulk movement of the material. Convection requires bulk movement of a fluid; heated fluid expands, becomes less dense, rises, and is replaced by cooler, denser fluid.

Question 2

Why do copper atoms not travel from the flame to the top of the rod?

Accepted Answer

Copper atoms remain at fixed lattice positions during heat conduction. Energy is carried mainly by mobile free electrons together with lattice vibrations, so the metal itself does not flow from the hot end to the cool end.

Question 3

Does microscopic motion stop when the burner is off at thermal equilibrium?

Accepted Answer

No. At uniform temperature, atoms and molecules still vibrate and move randomly, but there is no net heat transfer and no sustained natural-convection current. The burner-off model stop is set at 20 °C.

Question 4

Why does heated water rise in a beaker?

Accepted Answer

Heating makes the water expand and become less dense than the surrounding cooler water. The less-dense warm water rises, while cooler denser water sinks near the wall and returns inward near the bottom.

Question 5

Are conduction and convection the only ways heat can be transferred?

Accepted Answer

No. The three standard modes are conduction, convection, and radiation. This lab focuses on the first two: energy transfer through copper and bulk circulation in water.

Conduction & Convection — Heat Transfer in 3D

About this lab

Practice