Demos: 3A-04 Liquid Expansion
The flask is full with a colored liquid and the tube fits air tight. When the flask is heated, the colored liquid is clearly visible rising in the tube.
Directions: Carefully place the burner under the flask and watch the liquid rise in the tube. Remove the heat before the liquid reaches the top of the tube.
Suggestions for Presentation: Just as in solids (see 3A - 01), the expansion is small and cannot be seen under ordinary circumstances. The use of the small diameter tube allows a magnification similar to that in 3A -01 where we used the optical lever.
Applications: Because liquids expand upon heating, care must be taken to allow relief if the liquid is tightly contained.