When the bulk modulus of the medium increases, the speed of sound increases
The bulk modulus, which is often referred to as incompressibility, is a gauge of a substance's resistance to volume changes when compressed from all sides. It is determined by dividing the ratio of the applied pressure by the relative deformation.
Sound waves are mechanical waves, which means they are oscillations of matter. Hence they require a medium or system of particles (solid, liquid, or gas) to travel through. If the particles of the medium are near to each other, the transmission of energy is easy and hence, the wave travels faster.
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