Physics
Analog synthesis refers to a technology based on

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

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Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Metals are good conductors of heat
Plastics have a higher thermal conductivity than metals
Plastics have a lower density than metals
Metals have higher thermal capacity than plastics

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