Ball and ring; Plate with hole

Breaking Apparatus (break a small metal rod)

Bottle and tube

Gas bulb and U-tube

Relevant Resource Questions :

Concepts demonstrated :

• thermal expansion of solids

• Fergurson's pyrometer
• bunsen burner and matches

• Light the bunsen burner and heat the rod connected to the pyrometer.
• Observe the motion of the needle as the rod expands.
• Repeat the experiment cooling the rod using liquid nitrogen.

Physics involved :

This is a quantitative way of measuring the thermal expansion of solids. A lever system magnifies the expansion to move a needle through an arc.

How to use the Demonstration :

Everyday examples :

Things to do or add :

Other Comments :