Which of the following waves are capable of propagating without a medium?
mechanical waves
sound waves
electromagnetic waves
pressure waves

electromagnetic waves

Explanation:

Waves are normally classified into two broad categories depending on whether they require a material medium for transmission;

Electromagnetic Waves

Mechanical waves

Electromagnetic waves are capable of propagating without a medium while Mechanical waves need a material medium for their transmission.

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we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).