380 1-800-452-1261
Pressure—Gases, continued
Magdeburg Hemispheres
Simply hook up the hemispheres to a hand vacuum pump, an aspirator or vacuum
pump and evacuate the air. Close the valve and let the pulling begin! This economical
demonstration features a convenient two-way valve for easy operation and release,
two tough plastic 11-cm diameter hemispheres with wooden handles, and comes
complete with directions, experiment suggestions and historical information about
Magdeburg hemispheres. Requires a three-way valve or a 1/4" tubing connector to
attach to an electric vacuum pump.
Catalog No. Description Price/Each
AP4638 Magdeburg Hemispheres $46.28
AP5353 3-Way Valve for Vacuum Pump 59.00
AP8879 Tubing Connector, Straight, Polypropylene, 1/4" i.d. 4.84
Magdeburg Hemispheres, Rubber
Air is removed by simply pushing the two rubber plungers together. Once they
are together, your students will be amazed how difficult it is to pull them apart!
Have students design an experiment to determine how many Newtons of force are
required to pull them apart.
Catalog No. Description Price/Each
AP5661 Magdeburg Hemispheres, Rubber $21.50
Magdeburg Hemispheres
AP4638
Magdeburg
Hemispheres,
Rubber
AP5661
Pumps, Bicycle
Bicycle pumps have several applications in a physical science classroom. The
handheld bicycle pump is an excellent and inexpensive choice for pumping up
water rockets. Use the Bicycle Pump with Gauge and Release Valve for precise
quantitative pressure measurements. This bicycle pump is perfect for the Pressure
Bottle Demonstration (AP5930), Boyle’s Law in a Bottle Laboratory Kit (AP6855), and
Absolute Zero Device (AP4531). Gauge range: 0–260 psi. Both bicycle pumps are
made from durable aluminum and will last for years.
Elasticity of Gases
Apparatus
AP9022
Bicycle Pump,
Handheld
AP6910
Catalog No. Description Price/Each
AP6910 Bicycle Pump, Handheld $20.91
AP6884 Bicycle Pump with Gauge and Release Valve 82.08 Bicycle Pump with
Pumps, Vacuum See page 177.
Gauge and Release
Valve
AP6884
Harbottle
Simply place the balloon into the opening of the Harbottle and stretch the mouth of
the balloon over the mouth of the bottle. Blow into the balloon and, when it is fully
inflated, stopper the bottom hole of the Harbottle. Release your mouth—the balloon
stays inflated! No twisting or tying required. Surprise your students even more with
the strength of air pressure by filling the balloon with water before releasing the
stopper! Includes Harbottle, balloon, rubber stopper, and complete instructions.
Replacement balloons may be purchased separately.
Catalog No. Description Price/Each
AP7205 Harbottle $49.83
AP1900 Balloons, 12" Round, Latex, 20/Pkg. 5.50
Harbottle
AP7205
Elasticity of Gases Apparatus
By: The Flinn Staff
Demonstrate the elasticity of gases using this
simple instrument. Set a volume of gas in the piston, then use weights to pressurize
the system. As the weights are added, the volume of gas is decreased. Students plot
volume versus pressure to approximate Boyle’s law. Includes a six-page handout with
detailed teacher notes, back ground information and a reproducible student handout.
Catalog No. Description Price/Each
AP9022 Elasticity of Gases Apparatus $20.91
AP7102 Replacement Syringe for Elasticity of Gases Apparatus 5.48
PRESSURE continued on next page.
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