usually the standard jacks for aircrafts have a mono phone and microphone jacks. the phone is easily identified because the opening is bigger. One receives a phone and phone low audio, while the other takes the mic audio and mic key to the audio panel selector.
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Most jacks use oil and not water so nothing adverse would happen.
HE invented jacks b/c he use to like bouncing something and then trying to pick something up so he named it after himself and made it a game
If we consider the friction or screw jacks used to lift a vehicle to change a flat, almost all of those are made entirely of metal (steel). In the case of hydraulic jacks, they are made largely of steel, and have rubber for seals and hydraulic fluid to provide the media to perform the hydraulic work.