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they are not mechanical parts, a speaker also vibrates but is solid state



Speakers are not solid state by any definition I’ve run across (except for piezo ones, anyway).


Then a solenoid with a piece of membrane over it would also be solid state.

Why stop there, a servo with a piece of membrane would also be solid state.

Why stop there, a motor with a membrane..

This definition makes no sense to me.

The above are electromechanical parts. Piezos are somewhat an exception because electricity directly leads to a parts deformation without magnetic field moving a component of that part in an electric field. In fact a piezo is just one part with two contacts.


>Then a solenoid with a piece of membrane over it would also be solid state.

>Why stop there, a servo with a piece of membrane would also be solid state.

>Why stop there, a motor with a membrane..

>Piezos

All Correct.

Even when they are electrically powered, hydraulic and pneumatic servos are not usually liquid-state or gaseous-state electrical devices except for any vacuum tubes or electrolytic components.

When the electricity flows only through solid materials like copper, carbon, or silicon, and doesn't (intentionally) flow across things like liquids, air gaps, or evacuated spaces, that's solid-state.


"Solid state" has two meanings:

(1) The gaseous / solid meaning relevant for tubes vs. transistors.

(2) The mechanical / no moving parts meaning.

Two examples of devices that use the second meaning:

https://en.wikipedia.org/wiki/Solid-state_storage

The SS in SSD means it doesn't have moving parts (platter, head) like a hard drive.

https://en.wikipedia.org/wiki/Solid-state_relay

The SS in solid state relay means it's not electro-mechanical like a relay.

In this case (the cooling chip), the second meaning is obviously the correct one because it is being compared to fans, which have moving parts.


> All Correct.

Says who?


Says someone who incorrectly thinks "solid state" here refers to the state of matter and thinks anything that's neither liquid nor gaseous is "solid state".


But they were so confident about it!




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