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The speed of sound is one of those identifying physical characteristics that help identify substances in the physical world we live in. The speed of sound in dry air is 343.2 meters per second; this translates to 768 miles per hour, or about 1 mile every 5 seconds. Sound travels faster in liquids because the molecules or atoms of the liquid are more condensed than those of gaseous air. Energy of waves transfers faster in liquid particles than it does in gaseous particles. Likewise, solids have even faster speeds of sound than do liquids, for the same reason. The atoms or molecules of the solid is held together in a tight, rigid form, so the energy transmission is faster than that of liquids.
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