Student health: Give careful consideration to the selection of subjects – it may be helpful to know medical histories.
Never carry out an investigation on a human subject if you are not being supervised. Students should use a spirometer only under the direct supervision of a teacher. For example, Philip Harris offer a ‘pocket spirometer’ at around £140 which can be used outside the laboratory for collecting data in the field, and PASCO produce a datalogging spirometer (Pasport Spirometer) for which you would need the Data Studio software, but it produces instant traces on screen. There are some hand-held versions of spirometers available – small devices that measure air flow and calculate volume electronically. You could use these even if you do not have access to a spirometer, or if you feel it is too complicated to set up. We have also provided some example traces for your students to analyse and interpret. The notes include some of the hazards and risk control measures required for safe operation of the apparatus. These notes explain the working of a spirometer, so that students are aware of the apparatus and how it works. You can make a permanent record of the movements of the chamber either by attaching a pen to it and allowing it to write on a drum revolving slowly (kymograph) or by attaching a motion sensor which will convert movement into electronic signals that are then interpreted by your datalogging software.
There are several versions of this laboratory apparatus available, but all consist of a chamber (of capacity approximately 6 dm 3) suspended freely over water and counterbalanced so that gas passed in or drawn out makes the chamber rise or fall.
A spirometer is the standard equipment used to measure the capacity of the human lungs.
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