Pewter bell rings true after submersion in liquid Nitrogen.

• C+60+15

diagram for demo

Imperfections in a pewter bell lead to it having almost no sound when rung. If the bell is cooled in liquid nitrogen for a long time, however, the structure cools to a point that the bell will emit a pure and loud tone when struck with a rod.

Related Demos

C+60+20 Pressure Chamber for Demonstrating the Critical Temperature and Opalescence C+60+0 Hydraulic pump liquifies CO2 gas in glass column. C+60+5 LN2 demos: pewter bell and spring, color change tube, LN2 cannon. C+60+10 Film: "Unusual properties of liquid helium", sound, 16 min.