Air pressure:
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Air compressor operation
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Air is let through the regulator
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Inflating a mattress
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Balloon descent
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Rope torsion
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Air is blown through a glass tube
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Cut through the air with a gas burner
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Air release with a loud whistling creak,
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Balloon inflating
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Suction action of air
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Air is bleeding through a hose
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Construction, compressor discharges air
★★★★★