Ecology and Meteorology

Membrane filter method

Dependence of the soil temperature on the structure and wa-ter content of the soil

Principle

This experiment covers the separation and analysis of traces of sand, clay and humus in soil. These substances, both mineral and organic, appear in various types of soil and have a major effect on soil properties. The quantity of humus is the basis for the ...

Humidity preferendum of soil arthropods

Principle

Heat radiated by a lamp gradually causes soil to dry out. That and the light emitted cause any creatures in a sample to burrow to the bottom where they are sieved into a funnel and collected inside a vessel. The vessel contains moist filter paper in order to capture ...

Electrometric determination of dissolved oxygen in water

Hydrogen ion concentration of water

Water purification by filtration with active carbon

Principle

Active carbon is a good absorbent and as such is excellent when used as a filter. During water treatment, for example, active carbon filters are used to remove pesticides and detergents (soap and washing-up liquid). The cleansing of water can be demonstrated im ...

Air pollution through uncontrolled waste burning

Influence of temperature on the germination and growth of cress

Eight petri dishes are filled nearly to the brim with finely sieved, moist garden soil and 50 cress seeds are planted in each one. They are then placed inside a device which keeps each of the samples at a different temperature, whereby they are evenly distributed between cold and warm regio ...

Water quality - contamination with heavy metals

Principle

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 controlle ...

Water quality - contamination with heavy metals

Principle

Demonstration experiment using wireless data transmission to a large digital to display. Heavy metal ions can seep into water courses, for example from galvanising plants or other similar industries. They have the effect of suppressing the action of enzyme ...

Drinking water

Daily course of luminosity

Comparison of the heat capacities of water and soil

Comparison of the heat capacities of water and soil

Principle

These measurements help to quickly and simply introduce the term "heat capacity". The students learn
on which characteristics temperature changes of surfaces depend. As practical example, reference can
always be made here to the hot sand ...

The Bergmann rule: heat loss as a function of the body surface area and volume

Principle

Illustration of the heat loss for different relationships between volume and body surface area, using a model consisting of different sized round bottom flasks that are filled with water.