What happened to balloon when you pulled the rubber sheet downwards?
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As the diaphragm is pulled down, the volume of the cavity increases. This causes the pressure to decrease. Air rushes in to equalize the pressure, causing the balloonsto inflate. ... This causes an increase in pressure within the bell jar, the air rushes out of the balloons causing them to deflate.
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As the rubber sheet is pulled down the volume of the jar increases, the pressure therefore decreases and air is drawn in through the glass tube inflating the balloons, which represent the lungs.
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