Laboratory Materials

Measuring the height of a tower

Principle

The weather sensor can be used to determine the height of a tower as a function of the change in air pressure with the aid of the barometric formula.

Terrain mapping

Principle

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 userfriendly tool which provides altitude values so that ...

What happens during the flash recycling time of a camera?

Principle

You experience it with both digital and analogue cameras: You want to take a photo but it often takes several seconds until the flash is "loaded". This experiment illustrates what happens in that time and why it takes so long: The behaviour of the cur ...

Why do mobile phones or laptops need a charger/adapter?

Principle

In this experiment, the generation of alternating voltage and the conversion of it to direct voltage by means of rectifying and smoothing are presented.

An alternating voltage changes polarity periodically. The electricity network supplies a ...

How can ships made of steel float on water?

Principle

Everyone has at one time or another wondered how comes that ships made of steel can float on water but a steel ball simply sinks. Expanded bodies have the property of having less weight in water than in air, as one notices when one swims, for example. ...

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.