Boyle's Law Lecture Demonstrations

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Measuring Pressure with a Syringe and Baby Scale

Syringe on Baby Scale

A free-moving 30 cc glass syringe is plugged with a luer lok stopper with a trapped volume of 20 cc at atmospheric pressure.

The plunger is 7/8" in diameter (0.88") so the area is πr² = 0.60 in².

Push down on the scale with the plunger until V = 15 cc and measure weight (force), ~3 lb

New pressure = 3 lb/0.60 in² external + 14.7 atmospheric = 19.6 lb/in².

Push down on the scale witht the plunger until V = 10 cc and measure weight (force), ~9 lb

New pressure = 9 lb/0.60 in² external + 14.7 atmospheric = 29.4 lb/in².

For the three cases, PV = ~294, so P₁V₁ = k = P₂V₂

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Category: Lecture Demonstrations

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