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Author Topic: absolute error in a u-tube manometer??  (Read 1410 times)

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missUK11

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absolute error in a u-tube manometer??
« on: January 16, 2012, 06:25:57 AM »

If a U-tube manometer has graduations every 0.1mmHg, what is the absolute error in  :delta: h measured on the device? remember that   :delta: h requires you to read from two points on the scale (i.e.  :delta: h = h2-h1 )

The answer is apparently 0.71 but for some reason i am getting 0.071

i did (0.05)^2+(0.05)^2 all "square rooted".

Please someone help me !!

thanks x
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fledarmus

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Re: absolute error in a u-tube manometer??
« Reply #1 on: January 16, 2012, 07:14:18 AM »

Having an error of 0.71 reading on a scale that is +/- 0.05 doesn't make any sense - if your first measurement was 10.2 and your second was 10.1, you would be reporting a difference of 0.1 +/- 710%?

I'm guessing the answer key misplaced a decimal. Your answer sounds better.
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