pressure & temperature

D-and-C-book_103

Pressure & temperature

How pressure changes with temperature can be monitored using sensors. A graph of pressure against temperature can be plotted as it happens. After the experiment, the scale of the axis can be changed to estimate Absolute Zero.

Apparatus

Water bath, flask with bung, delivery tube, interface, temperature and pressure sensors.

Setting up

If desired, flush the flask with dry air, then seal it.

Connect the pressure sensor to socket 1 and the temperature sensor to socket 2.

If the sensors are adjustable, set a 10kPa range on the pressure sensor and a 0-100°C range on the temperature sensor. Some systems recognise the sensors you attach automatically, in others you do this yourself.

Your software may allow you to plot
the pressure against temperature as the experiment proceeds rather than afterwards.

Recording the data

Record for 10 minutes. Start heating the flask, after 5 minutes allow it to cool.

Using the results

What does the graph tell you about the change in pressure?

What does the graph tell you about the change in temperature?

Use the software to plot the pressure against the temperature.

What seems to be the pattern between pressure and temperature?

Set the temperature axis to include absolute zero and extrapolate the graph down to absolute zero.

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