Liquid Nitrogen

 

Summary:  Freeze items and explore gas laws with liquid nitrogen

 

Hazards: 

Liquid nitrogen is extremely cold.  Wear gloves and use tongs.

 

Chemicals and Solutions: 

Large dewar of Liquid nitrogen

 

Materials: 

Wide mouth dewar

gloves

tongs or forceps

flowers

balloon

rubber tubing

hammer

 

Procedure: 

The following items are available:

Fresh flowers: They will crumble easily after being dunked in liquid nitrogen. (Nature permitting)

Balloons filled with air: show the decrease in the volume of gas. – Fun demonstration, pull numerous inflated balloons out of a dewar.  At room temperature the balloons have a volume that is the same as the dewar.

Rubber ball or rubber tubing: show how they become brittle.

Various toys that shatter in fun ways.

Liquid nitrogen Ice cream

 

Discussion: 

Boiling Points

Helium

-268.9° C

Hydrogen

-252.9° C

Nitrogen

-195.8° C

Oxygen

-182.95°C

 

 

 

To schedule a demonstration, please send an email to the demonstration lab.

 

Contact:

Eric Camp

Lecture Demonstration Technician

Bagley Hall 171

(206) 543-1606

ericcamp@uw.edu

 

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