Adiabatic Changes in a Gas
Goal: To measure the change in pressure as a gas is heated
- Heat resistant glass jar or calibrated cylindar
- Hot plate
- Disk cut to fit glass jar -- cut slightly smaller than inside of jar. Add handle for eas of use.
- Rubber band or washer that can fit on disk to form seal. Disk should be movable, but should stay in position when put in place.
- Alternative, use gas expanding in a sealed distillation chamber against air pressure on another vessel.
- Determine a procedure that will allow you to heat the gas in the jar (air) and watch the piston rise a measurable amount. You must be able to insert the thermometer inside your piston chamber to measure temperature change. If possible, vary the weight of the piston.
- Can you think of any way to vary the gas within the piston chamber?
- Create a table for your data including trial run identifier, temperature and time, and raw piston position measurement.
- Calibrate volume within piston for each piston position.
- Determine pressure exerted upward against piston weight.
- Plot pressure (or volume) vs. temperature change over at least a 40 °C temperature range.
- Follow the guidelines for filing a formal report of your process, materials, data collection and handling, and conclusions.
Post your report to the Lab thread at the Moodle.
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