TESS - Training and Experimental System for Students

Raised bog and fen

Principle

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, whi ...

Air pressure and relative humidity in an aircraft

Principle

This experiment examines why people suffer from earaches during take-off and landing, as well as from dry eyes during long flights.

Salinity changes of a watercourse

Principle

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 me ...

Learning stations using the experimentation case"Cobra4 Mobile, Environment and outdoors"

Principle

We are dealing here with circuit learning for four work groups. Use is made of the Cobra4 Sensor-Units and Mobile-Link handheld measuring instruments that are provided in the environment and outdoors experimentation case. One of each of the instrument ...

We visit a wastewater treatment plant

Principle

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 t ...

We determine our heart frequency EP2

Principle

An electrocardiogram (ECG) enables you to observe the regular sequence of heart contractions as well as to determine your heart frequency by determining the interval between two heart contractions. In a second experiment, you will measure the heart f ...

We investigate our physical fitness - the heart under stressEP3

Principle

An electrocardiogram (ECG) can record the sum of the electrical activities of all of the heart muscle fibres. Under stress, cardiac activity increases in order to maintain the stability of the cardiovascular system. The heart contraction cannot be con ...

We measure our reading speed - measuring reading skills EP6

Principle

With this experiment, you can determine your own personal reading speed. One's reading speed can be trained and is an important prerequisite for the proper handling of all kinds of texts. You can precisely study the movement of your eyes during the m ...

Generation of sound waves

Principle

Sounds are generated by oscillations. The sound volume is influenced by their relative amplitude, while the sound pitch depends on their frequency. This relationship is examined based on three examples: oscillating ruler, tuning fork, string of a mon ...

Propagation of sound in air

Principle

This experiment demonstrates, particularly clearly, the propagation of sound waves in air and, thereby,
the working principle of the eardrum that is caused to oscillate by pressure waves.

The movement of the membrane is transfe ...

Propagation of sound in solid bodies

Principle

The transmission (or conduction) of sound through a solid body means: One end of the solid body is caused to oscillate (e.g. by placing a tuning fork on it). This oscillation propagates through the solid body to the other end of the solid body. The tr ...

Propagation of sound in water

Principle

The aim of this experiment is to enable the students to find out that sound can also propagate in other media, e.g. liquids. For this purpose, they study the propagation of the sound of a tuning fork in a tube that can be filled with air or water. For ...

Sound as a sine wave

Principle

The aim of this experiment is to familiarise the students with the "measure Acoustics" software. First, the students record the sounds of two tuning forks with a microphone. Then, they analyse the frequency spectrum and the course of the amplitude of ...

Sound and noise

Principle

Oscillations can be transferred through a medium (e.g. air or wood) in the form of sound waves. An oscillation with exactly one oscillation frequency is called harmonic oscillation or pure oscillation. In the amplitude-time-diagram, such an oscillatio ...

Lower and upper hearing threshold

Principle

The human ear registers deep and high sounds as well as faint and loud sounds. Are there limits or can we hear any kind of high and deep sounds? In this experiment, the students learn that the human ear can perceive sound only within a limited frequen ...