4E10.10 - Charles' Law and Gas Pressure Doing Work - Glass Piston
Video Credit: Jonathan M. Sullivan-Wood.
Use your hands to warm the bulb. The grill lighter may be used if a higher temperature is desired. When warmed the liquid in the manometer should move quite dramatically. The ice bath can be used to make the liquid move in the opposite direction.
Since the liquid level rises only a few cm maximum the entire system is essentially at a constant pressure.
Assemble the unit as shown. Place the Bunsen burner under the flask and in about 30 seconds the plunger will start to move. Place 100 grams of weight on the plunger and in a few more seconds it will again rise with the additional weight.
IMPORTANT NOTES: As soon as the plunger starts to rise with the additional weight remove the flame, and either add additional weights before the plunger reaches the top of its stroke or be sure to catch it as it pops our under pressure.
BE sure that at no time, under any conditions, can the plunger fall out and break!!!!!!
This syringe will need very light lubrication at most.
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