Heavy-metal ions may be carried into surface or ground water
from mining fields or via the waste water of galvanicor 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 be ...
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 ...
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 ...
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: ...
The sizes of the soil particles and the proportions of them are
of great importance for the profitable use and fertility of the
soil. A rough separation of soil particles according to their size,
and an assessment of the proportions of them, can be made by
suspending them in ...
Investigation of the chalk content of garden soil, sand and
further soil samples.The chalk (lime) content of the soil is
important for plants in several respects. It affects the quality of
the soil, e.g. its acidity, heat retention capacity, water balance
and aeration. In ...
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