आपेक्षिकी

सापेक्षता और आपेक्षिकीय खगोल-भौतिकी के सामान्य सिद्धांत ( 1962 - 71 )

Einsteins theory of the universe,which states that all motion is relative and treats time as a fourth dimension related to space.Tell me what is the relativity of water and mercury.