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Air is a substance which has the lowest density of about 1.225 kg / m^3.Explanation:The mass of a substance per volume describes the density. Larger molecules have more density and more mass. Hence the sound is transmitted slowly. Sound waves are made up of kinetic energy and for the vibration of large molecules, more energy is needed. In general, sound travels faster in liquids than in gases because density is inversely proportional to the speed of sound and the density of air is low.The speed of sound varies with temperature because a change in temperature affects material density. In the air, an increase in temperature increases the speed of sound.

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