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Why Do Slightly Opened Car Windows Make That Awful Sound?

Read how changes in air pressure make annoying sounds.

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Energy in the Air: Sounds from the Orchestra

Explores the music made by a symphony orchestra, with historical facts, several sound samples and illustrations for each instrument group.

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Voice Acoustics: an introduction

A comprehensive article explaining how the voice works, looking at how different parts of the body absorb certain sounds to how sound is created by the vocal chords.

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hyperphysics

Quality and timbre

Sound "quality" or "timbre" describes those characteristics which allow the ear to distinguish sounds which have the same pitch and loudness.

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Vacuum Tubes

The conduction of electricity in thin gases in vacuum tubes was the key to the discovery of the electron in 1897.Description of the discovery of Cathode rays.

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Silent bell - Marvin and Milo

A Marvin and Milo activity about sound vacuum. All you need is a glass bottle, pipe cleaner, small bell, wine saver pump and stopper.

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How Thermoses (Vacuum Flasks) Work

An excellent description of how Thermoses (Vacuum Flasks) work using heat transfer principles. From HowStuffWorks.com. An extremely good, informative site.

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Why do ion engines need a vacuum to work?

A brief explanation why ion engines need a vacuum

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Bending sound, the weird path of sound in the ocean

Read about how sound travels in the ocean, the SoFAR channel and one experiment to test how far could you hear a sound underwater.

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Play a Piano / Synthesizer / Oscilloscope

This virtual reality Java piano lets you play the piano and have a little fun while learning the relationship between the sounds, music theory, musical scales, and the underlying math and physics of ...

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