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If I was to knock on a wall or door between a pressurised room and a vacuum, would that sound different from knocking on a wall or door of the same material between two pressurised rooms?
If not, would there be any easy way to check if a room is depressurised, using only human senses and without opening the door?
If there is a wall between a pressurised room and a vacuum, the resulting forces to the wall are pretty strong. Strings of a guitar sound different if tension on the string varies. I suspect the wall would sound different. The force on a door between vacuum and pressure is so strong that opening of the door would be impossible or the door is severly damaged.
I have seen a normal room door bending by a pressure difference between both adjacent rooms. The pressure difference was very small, only some centimeters of water or a few mbar. It was possible to open the door, but you had to use all your muscles. The force to a door 1 m wide and 2 m high from a pressure difference of 1 bar is the same as of a load of 20,000 kg to the ground below. It is better to build not a rectangular door but a circular one.
I suspect there would be a difference: a door between a pressurized area and a vacuum is under pressure from one side. Compare to a guitar string: they sound different when you vary the pressure on them.
