Physics
A small gap is left at the joints of rails in a railway track to

Avoid the heating of tracks to high temperature
Avoid the tracks being distorted due to seasonal temperature variation
Keep the rails equidistant
Control the speed of train

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Physics
Analog synthesis refers to a technology based on

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

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