Change Of State Of Ln - Popping Can Lid

Purpose

To show the increase in volume which accompanies the transition from liquid to gaseous nitrogen.
 

Equipment

Liquid nitrogen, can with plastic lid.

 

Images

i4-13

Description

Pour some liquid nitrogen into a can and install the plastic lid. The liquid nitrogen heats up, changes to a gas, and blows the lid. Repeat for students who blinked.
 

References

P. A. Knutson and G. L. Salinger, A Simple Measurement of the Heat of Vaporizattion of Liquid Nitrogen, TPT 7, 288-289 (1969).