Question

why ether was called a hypothetical medium

Answer 1

Ether or aether, in physics and astronomy, a hypothetical medium for transmitting light and heat (radiation), filling all unoccupied space; it is also called luminiferous ether. ... Ether was held to be invisible, without odor, and of such a nature that it did not interfere with the motions of bodies through space.

Answer 2

The two properties of ether i.e. very low value of density and very large volume of elasticity are contradictory in nature. A medium having such properties cannot be received. For this reason ether was called hypothetical medium.

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