The first definition you need to know is noise floor.
Compression in flooring means.
When it comes to floors strength often relates to compressive strength the capacity of a flooring material to withstand heavy loads and resist compression density materials being pressed together.
Compressive strength looks at how much of a load a floor can handle and is usually reported in relationship to a specific technical standard.
Ambient noise includes wind traffic people talking people moving around any natural noise in the environment.
The noise floor is the amount of ambient noise in the environment and the residual electronic noise present in the sound system.
The unit of measurement is called millimeters of mercury which is a measurement of pressure also used in blood pressure.
It is generally associated with prolonged extreme moisture conditions via high relative humidity.
Compression fittings are made from a variety of materials.
They are also commonly made from plastic and stainless steel.
These will explain why compression needs to be used.