What is a medium? In science.

The "medium" is the substance or material that carries a mechanical wave. One of the most important things to remember about waves is that they transport energy, not matter. This makes them different from other phenomenon in physics.

Explanation:

The substance or material that carries a mechanical wave is referred to as the "medium." The fact that waves transport energy rather than matter is one of the most important things to remember about them. This distinguishes them from other physics phenomena.

Explanation: hope this helps

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"the periodic table is arranged in order of atomic number."