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Students are introduced to a semi-automated method of measurement using a positioning device. They also explore the strength of the magnetic field around and inside a coil, which requires them to position the equipment accurately. They then plot the distance against the magnetic flux on a graph.
Activity Measuring the magnetic field in a coil using the positioning device
High School (14-18 years)
Students are introduced to a semi-automated method of measurement using a positioning device. They also explore the strength of the magnetic field around and inside a coil, which requires them to position the equipment accurately. They then plot the distance against the magnetic flux on a graph.
Activity Measuring the magnetic field in a coil using the positioning device
In this activity, students investigate the nitrate content in, for example, pond or aquarium water. The nitrite formed is subsequently determined using the Griess reaction. The intensity of the color is proportional to the amount of nitrite, and thus indirectly to the original amount of nitrate. As a result, the nitrate content can be determined using a colorimeter.
Concepts learned:
- Extinction
- Spectrophotometry
- Calibration curve
- Lambert-Beer Law
Students learn to work with the gas chromatographer (BT45i) while doing this activity. They use hydrogen gas obtained from the Hofmann apparatus. This activity is easy and fast and helps students to master the BT45i so they can use the gas chromatographer for other more challenging activities. Hydrogen gas gives an easy to analyse chromatogram.
Activity Gas chromatography
In this activity the blood pressure is derived from measurements with the blood pressure sensor. In the analysis the oscillometric method is used.
Activity Blood pressure