No special hazards are recognized in this experiment. Follow normal laboratory precautions. Have a mop or other water cleanup material available. Go to Top Disposal Discard water down the sink. For a given amount of water added, the pressure increment would be smaller if the diameter were larger, so the volume change will be smaller.
All ideal gases behave the same way.
Changing the gas has no effect. Go to Top Computer Use Students may enter the class' data directly into a worksheet of a spreadsheet computer program. See EXPT 134 for suggestions. There are several ways to approach the data analysis. We have chosen to calculate the actual air pressure in kPa, and to calculate the pressure of the added water masses in these units.