Why we cant see the waves of sound through our eyes? As we cant see them then how can we tell that sound travels in waves?

We can see it in other medium like water but not in air so how can we tell it ?

Sound is the disturbance created in particles of the medium. As we cannot see air molecules so we are not able to see sound wave propagation in air. Similarly we can see water and the disturbance created in it also visible to us thus we can sense the propagation of sound through water.

By seeing sound wave propagation in other materials we concluded that it is travelled by creating pressure gradient.

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You detect sound by feeling the impact of the sound waves on your eardrum. Therefore it is the momentum of the pressure wave that leads to its detection. Photons do not have enough momentum individually to be able to detect their impact for reasonable light intensities. 

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