Pressure Measurements

Here are a few to get you started. A search of J. Chem. Educ.  on  pressure, vapor pressure, gas laws, and other similar search terms will get you hundreds of hits for your consideration. Some experiments do not require pressure measurements but use a leveling bulb to maintain atmospheric pressure in a closed system. Others require pressures that exceed 2 atm, the limit of the MicroLab FS-522 built in pressure gauge.

MicroLab’s newsletter also describes some featured pressure lab applications from two of our college chemistry professor colleagues.

Of course, the ultimate simple gas law experiment uses MicroLab’s syringe and tubing (which come with the FS-522 unit) hooked up to the pressure sensor to explore Boyle’s Law, using sensor pressure output and the computer keyboard to input the syringe volume. Simple, easy, fast, and amazingly accurate. Main sources of error are (1) warm hands heating the syringe and gas during the experiment; (2) ignoring the small dead volume of about 2 mL in the tubing and sensor. A variety of pure gases (Ar, CO2, O2, He, etc.) and mixtures (air, natural gas) can be explored and their Boyles Law constants compared. This can easily be completed in a two hour lab.

Vapor Pressure Plus: An Experiment for Studying Phase Equilibria in Water, with Observation of Supercooling, Spontaneous Freezing, and the Triple Point
Joel Tellinghuisen
J. Chem. Educ., 2010, 87 (6), pp 619–622

Enthalpy of Vaporization and Vapor Pressures: An Inexpensive Apparatus
Rubin Battino , David A. Dolson and Michael R. Hall , Trevor M. Letcher
J. Chem. Educ., 2007, 84 (5), p 822

This experiment is made even simpler with the MicroLab pressure sensor and temperature senor.

The Determination of the Percent of Oxygen in Air Using a Gas Pressure Sensor
James Gordon and Katherine Chancey
J. Chem. Educ., 2005, 82 (2), p 286

Pressure and Stoichiometry
Catherine L. McCluskey , Charles E. Roser
J. Chem. Educ., 1999, 76 (5), p 638

Very simple with the pressure sensor and MicroLab software.