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Longitudinal wave, wave consisting of a periodic disturbance or vibration that takes place in the same direction as the advance of the wave. ... Sound moving through air also compresses and rarefies the gas in the direction of travel of the sound wave as they vibrate back and forth.
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Essay on Wonders of Science: Science is a blessing to human beings. It makes our life comfortable. ... Our lifestyle become ease with the wonderful inventions of science like electricity, fans, air-conditioners, television, mobile phones, motor vehicles, etc., and now it is almost impossible to live without using them.
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