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Teacher Developed Classroom Tested

View direct, accurate illustrations of the basic relationship between pressure, volume and temperature of gases. This unique apparatus will demonstrate Boyle’s Law and Absolute Zero Determination on any overhead projector.
• Boyle’s Law: A calibrated syringe is connected to a direct-reading pressure gauge.
As the volume of the gas in the syringe is varied, the entire class sees the corresponding pressure changes projected on the screen. When the results are graphed, a hyperbolic curve is produced.
--Absolute Zero Determination: A one-piece metal sphere is connected to the direct-reading pressure gauge projected on the screen.
When the sphere containing a gas is immersed in water at various temperatures, the entire class can read the pressure changes directly off the scale on the screen. When temperature vs. pressure readings are graphed, absolute zero is determined by extrapolation. A study guide is included.

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