Surface tension

Surface tension is the property of a liquid that allows it to obtain the smallest surface area possible.

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A hot air balloon is a balloon aircraft in which is lifted by hot air.

Characteristics of sound waves

This animation explains the most important characteristics of waves through sound waves.

Suction pumps and direct action pumps

Direct action pumps and suction pumps are among the simplest water pumps.

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Kepler´s laws of planetary motion

The three important laws describing planetary motion were formulated by Johannes Kepler.

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Thermal expansion of bridges

The length of the metal frameworks of bridges change when the temperature changes.

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