Air pressure:
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Air is let through the regulator
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Mask breathing
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Air is blown through a glass tube
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Truck Air Brakes
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Air is bleeding through a hose
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Inflating a mattress
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A stream of air breaks out of a metal pipe
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Helium balloon
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Air bleed, cylinder pressure, Air compressor
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Soccer ball
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Balloon descent
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The work of oxygen equipment, the release of
★★★★★