Vapor Pressure of Water at Various Temperatures

Hazards: 

The apparatus is fragile and filled with mercury, please handle it gently.

Chemicals and Solutions: 

Materials: 

Vapor pressure of water apparatus

Hot plates

Two 4 liter beakers

Meter stick

Procedure: 

About 1 hour before classtime, 2/3  fill one beaker with water and heat the water on a hot plate,

Place the other empty beaker on another hotplate and then clamp the vapor pressure of water apparatus so that it is suspended inside the beaker.  Make sure the hotplate is OFF.

Show students the vapor pressure of water at room temperature.  Then pour the previously heated water into the vessel containing the apparatus.  Again measure the vapor pressure and temperature.  The water can be heated furthur by turning on the hotplate.

 

Discussion: 

Vapor pressure of water (mm Hg) vs. temperature (ºC)

17.5 mm Hg                                                   20

31.8 mm Hg                                                   30

55.3 mm Hg                                                   40

92.3 mm Hg                                                   50

147  mm Hg                                                   60

233  mm Hg                                                   70

355  mm Hg                                                   80

526  mm Hg                                                   90

760  mm Hg                                                   100

 

To schedule a demonstration, please send an email to the demonstration lab.

 

Contact:

Eric Camp

Lecture Demonstration Technician

Bagley Hall 171

(206) 543-1606

ericcamp@uw.edu

 

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