Laboratory Materials

Centripetal force

Principle

The examination of the dependencies of the centripetal force is a classic experiment of mechanics. Here and in experiments with rotational movements in general radio transmission offers many advantages. Conventional setups of experiments to measure th ...

Melting and freezing curve of sodium thiosulphate

Principle

How does a temperature curve express the change of state of a substance that occurs when it is heated or cooled?

Tasks

Heat sodium thiosulphate until it melts and let it cool down again. Measure the behaviour of the ...

Electrolysis

Tasks

Measure the characteristic curve of current against voltage of an electrolytic bath containing copper sulphate solution and having copper electrodes. Observe visible changes in the electrodes and the bath.

Temperature change when a gas is liquefied by compression

Principle

When gases are liquefied by compression, they emit heat into their surroundings. When they expand again and vaporise, they cool down. This attribute is used in the operation of refrigerators, for example.

Briggs-Rauscher-Reaction

Principle

Under some circumstances, complex reactions can occur whose reaction rate does not monotonously change, but is subject to periodic fluctuations. These fluctuations can be experimentally followed by measuring the potential over a definite time period. ...

Photosynthesis

Principle

This experiment shows that carbon dioxide is consumed during photosynthesis, whereas it is produced through cellular respiration.

Pulse at rest and during exercise

Principle

Exercises change the frequency of our pulse. The difference between a pulse at rest and a pulse after exercise will be studied in this experiment.

How much air can our lungs contain?

Principle

Lungs are organs which enable carbon dioxide (CO2) to be exhaled and oxygen (O2) to be absorbed. Contraction of the diaphragm connected to the lungs causes them to stretch so that air is drawn into them from the surroundings. When the diaphragm subseq ...

Direct determination of lung volume from a spirogram

Principle

The lung is the organ which plays a decisive role in the exchange of gases with the surroundings. The membrane with which the lung is lined releases CO2 from the blood in which it is dissolved and passes O2 into the blood. To breathe in, the diaphrag ...

Does the lung volume depend on how tall you are?

Principle

In this experiment, you are to determine if lung volume is dependent on gender or on how tall you are.
For this, you are first to measure your vital capacity (VC) using a spirometer. Following this, you are to
separate the measured values ...

Which method enables lung illnesses to be diagnosed?

Principle

The forced expiratory volume (FEV) in one second is used in the diagnosis of lung illnesses. For the measurement of this here, the student carrying out the test breathes normally a few times, presses out all the air he or she can, takes a deep breath ...

Why do energy-saving lamps need some time to achieve fullbrightness?

Principle

Energy-saving lamps (compact fluorescent lamps) are increasingly replacing customary filament lamps. They have the characteristic that they need a longer time until their light reaches full brightness, because their brightness is temperature dependent ...

Why do light bulbs burn out mostly when being turned on?

Principle

You know it all too well: You turn the light on and nothing happens except perhaps a pop! This experiment explains why filament lamps "burn out" and why it almost always happens when they are turned on.

Floating and sinking

Principle

The buoyancy force is equal to the force of the weight of the liquid displaced: This experiment uses the archimedean principle to determine to which extent the buoyancy depends on the mass and volume of a body and the density of the liquid, using ever ...

Altitude measurement on a trail

Principle

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 ...