The property or quality of being able to be pressed down or squeezed into a smaller space.
From 'compress' (Latin 'comprimere': 'com-' together + 'premere' to press) plus '-ibility' (capacity or ability). It describes how much something can be reduced in size.
Compressibility is why water is nearly impossible to compress (its molecules are already touching) while air is super compressible—a fact that made hydraulic brakes possible!
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