Pressure Law.

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Presentation transcript:

Pressure Law

Procedure: 1. Air trapped in a flask is heated in a water bath. 2. Use the thermometer and Bourdon gauge to measure the temperature and the pressure of the air. 3. Take about several readings with different temperature.

Result

Graph Plotting Pressure / kPa 130 120 110 100 90 Temp. / C 20 40 60 80

Pressure - Temperature What is this relation?

Result The graph of pressure against temperature is a straight line. Is Pressure directly proportional to Temp.? Pressure Temperature

Is P directly proportional to T? Pressure Temperature / C P = T + constant (y-intercept)

Is P directly proportional to T? Pressure Temperature

Is P directly proportional to T? Pressure Temperature

Is P directly proportional to T? Pressure Temperature

Is P directly proportional to T? Pressure Temperature -273C

Is P directly proportional to T? Pressure Temperature -273C

Is P directly proportional to T? Pressure Temperature -273C 0 K 273K P is directly proportional to T!

Is P directly proportional to T? Kelvin Scale Pressure K = 273 + C Temperature 0 K 273K P is directly proportional to T!

Result

Result

Graph Plotting

Conclusion P  T P/T = constant P1 /T1 = P2/T2 Pressure Law Pressure of a fixed mass of gas at constant volume is directly proportional to its Kelvin temperature.