Gases

Under construction...

Golf Ball Atmosphere

[L | t | ★★★]
Demonstration of molecular motion and pressure using golf balls.

[In-Depth Description]

OHP Kinetic Theory Model

[M | t+ | ★★★]
Simulation of molecular motion (Brownian, diffusion, etc.) with ball bearings on shaking table.

[In-Depth Description]

Marshmallow in Vacuum

[ M | t | ★★★ ]
A polycarbonate bell jar is loaded with marshmallow(s), and the air evacuated. Expansion ensues, followed by frantic shriveling when the air is re-introduced.

55 Gallon Drum Collapse

[ L | t | ★★★★ ]
Drum evacuated by vacuum pump; crushed by atmospheric bombardment.

https://sciencedemonstrations.fas.harvard.edu/presentations/collapse-55…

Hot and Cold Gas in Balloons

[ M | t+ | ★★★ ]
A balloon is dropped in boiling water, and another balloon is cooled with liquid nitrogen to demonstrate the effect of temperature on volume of gas in a balloon.

[In-Depth Description]

Change of Volume with State

[M | t+ | ★★]
CO₂ and He balloons in liquid nitrogen.
[In-Depth Description]

Sublimation of CO₂

[M | t | —]
Solid dry ice turns directly into gaseous state.

Solid, Liquid, Gaseous CO₂

[S | t+ | —]
Observation of phase changes with corresponding pressure changes.

[In-depth description]

Liquid Nitrogen Trash Can

[ S | t | ★★★ ]
An inverted trash can is launched into the air by an exploding bottle of liquid nitrogen.

[In-Depth Description]

Speed of Sound in Helium and SF₆

[ M | t | ★★★ ]
Cylinders of helium and sulfur hexafluoride with tubing and regulators set to play an organ pipe, which will also be played by the lecturer to demonstrate the speed of sound in air.

Flaming Vapor Ramp

[ M | t+ | ★★★★ ]
Cyclohexane vapor catches on fire when it flows downwards to a burning candle at the bottom of a ramp.

[In-Depth Description]

PVT Surfaces

[M | t | —]
Three-dimensional plaster model of PVT relationships.

[In-Depth Description]

Contact Us

Mailing Address: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138
Campus Location: Science Center B-08A | Tel: (617) 495-5824 | Email: scidemos@fas.harvard.edu