Principle
Heavy-metal ions may be carried into surface or ground water from mining fields or via the waste water of galvanic or similar production sites. They block the effect of enzymes so that the processes in the metabolism of the organisms that are controlled by these enzymes may ...
Some gases such as hydrogen chloride dissolve readily in water. For example, 1 litre of water at 20 °C can dissolve approximately 443 litres of hydrogen chloride. For example, vacuum builds up quickly in a closed flask when the gas comes in contact with water, because the gas ...
This experiment shows how much the quality of drinking water of various locations in the same region can vary. The comparison of tap water with bottled mineral water and distilled water leads to surprising results.
Benefits
The altitude profile of a hiking trail or route to school can be measured during a school trip or as an exercise for the students. The altitude profile can also be used to demonstrate that the atmospheric pressure decreases when the altitude increases. As a result, the experiment is ...
The compact Cobra4 "Weather" multisensor can be employed as a simple means to set up a weather station, which can then be used to explain the relationship between air pressure, humidity, temperature, and light intensity. The measurement combination of a Cobra4 Mobile-Link and a ...
The drawing of maps is one of the favourite tasks of the students during geography lessons and of a high didactic value. The altitude measuring function of the Cobra4 Sensor-Unit "Weather" is a user-friendly tool which provides altitude values so that contour lines can be added ...
Why are there only a few different kinds of plants in a deciduous forest? Except for having trees that are all approximately of the same height, hardly any other plants grow in a deciduous forest, except for young plants of the same type of trees. This experiment shows how the ...
The pH value (a measure of the concentration of hydrogen ions) in running waters depends on the geological conditions, the pollution load that is caused by agricultural production, and on plant activities. This experiment shows how the pH value of a stream changes even at a short ...
How does the temperature of the air affect the temperature of the soil in the course of a day?
Information concerning the quality of soils is of great importance for agricultural production. The students are familiarised with this subject via two experiments with pH measurements that show how much soils may differ from each other (experiment "Characteristic pH values ...
How suitable are certain soils and plant substrates for the nutrition of plants? This experiment is about measuring the conductivity, which in turn provides information as to which of the examined soils and plant substrates already contain nutrient salts for plant growth and to ...
Bogs and fens are habitats of plants that are specialised in soils with constant excess water. Apart from this specialisation, bogs and fens differ significantly from each other. Raised bogs and fens, for example, have different plant communities, which is due to their varied ...
This experiment shows how the salt that is washed out of an abandoned potassium rock pile drastically increases the salinity of a watercourse, as well as how the salinity decreases only slightly further downstream, and how the salinity can still be measured after the stream has ...
A visit to a water treatment plant reveals some fascinating procedures and purification methods. We will not merely be concerned with interesting impressions, but instead we will increase our understanding for microbiological processes by measuring the key parameters: ...
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