Surface tension

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

Related extras

Exceeding the speed of sound

What is the speed of sound? What happens when an object exceeds the speed of sound?

Thermal expansion of bridges

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

Straw flute (observation)

Observe what happens when making sounds with shorter and shorter pieces of the same straw.

Resonance straw

Find out how to move the straws without touching them, using the phenomenon of resonance.

Simple harmonic motion and uniform circular motion

Simple harmonic motion can be considered to be the one-dimensional projection of uniform...

Properties of matter: mass, volume and density

In certain cases, liquids do not mix together, and form layers instead. See what happens when we...

Kepler´s laws of planetary motion

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


A spacecraft on its path is in a constant state of free fall.

Added to your cart.