Physics
A fountain pen works on the principle of

Capillary action
Flow of liquids from higher to lower potential
Bernoulli's principle
Viscosity of liquids

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Physics
Analog synthesis refers to a technology based on

Representing data in terms of measurable physical quantities.
Interfacing synthesizer equipment.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.
Representing physical quantities as numbers.

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