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Old Jan 2nd 2018, 12:18 PM   #1
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Does this show atmospheric pressure or air resistance?

I'm teaching at a private school and the very first demo shown to Yr 8 Science students to explain air pressure was this as shown in the attachment.

I've seen similar experiments online all claiming to show that there's atmospheric pressure.

However, I see it as showing air resistance, not atmospheric pressure, as atmospheric pressure is a static measurement and as soon at the paper/ruler combination starts to move, it meets air resistance indirectly as a result of atmospheric pressure. You could put 4 paper/ruler combinations at 90 degrees to each other, creating a crude propeller and generate equal force from each 'paddle", not just to the one moving directly upwards against gravity, right?

Could anyone clarify this for me please?
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Does this show atmospheric pressure or air resistance?-pressure-demo-1.png  
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