Seconds pendulum

How can this pendulum accurately measure time in seconds?

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Straw flute

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

Properties of matter: mass, volume and density

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

The faithful cork

How does a piece of a cork behave on the surface of a glass of water? You can examine that in...

Cartesian diver

Objects denser than water sink in water.

What do you know about speed?

This lesson presents the concept of speed.

Can we vacuum on the Moon?

This lesson explains the concept of atmospheric pressure.

The wave phenomena of sound

When does echo form? Why does sound spread easier at night? What is the secret to a good...

Ubådsoperation

Ubåde dykker og kommer tilbage til overfladen ved at ændre skrogets gennemsnitlige tæthed.

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