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Topic: Barometric Pressure!  (Read 8671 times)

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cambaby

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Barometric Pressure!
« on: October 17, 2005, 10:07:14 PM »
Ok, I am totally lost in chemistry!
Here's the fun question:
If the barometric pressure is 747mm Hg, what would the
pressure be in cm H20??
Thanks!!! ???
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Offline mike

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Re:Barometric Pressure!
« Reply #1 on: October 17, 2005, 10:47:51 PM »
1.0 Pascal = 9.869e-6 atm = 1.0e-5 bar = 7.501e-4 cmHg = 10.0 dyne/cm^2= 2.089e-2 lbs/ft^2 = 1.450e-4 lbs/in^2 = 7.501e-3 mmHg = 0.01 cmH2O


It is just a conversion

 :)
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cambaby

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Re:Barometric Pressure!
« Reply #2 on: October 18, 2005, 08:21:46 AM »
thank-u    u r my hero
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Offline jdurg

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Re:Barometric Pressure!
« Reply #3 on: October 21, 2005, 02:59:24 PM »
Quote from: mike on October 17, 2005, 10:47:51 PM
1.0 Pascal = 9.869e-6 atm = 1.0e-5 bar = 7.501e-4 cmHg = 10.0 dyne/cm^2= 2.089e-2 lbs/ft^2 = 1.450e-4 lbs/in^2 = 7.501e-3 mmHg = 0.01 cmH2O


It is just a conversion

 :)

Something's not right there.  The pressure of something in terms of cm H2O would be MUCH higher than the pressure of something in mmHg because Hg is so much denser than water.  747 mmHg * 133.28Pa/mmHg = 99560.16 Pa.  99560.16 Pa * 1x10^-5 bar/Pa = 0.9956016 bar.  0.9956016 bar * 0.9872 atm/bar = 0.98286 atmospheres.  0.98286 atm * 1033.4244 cm H2O/atm = 1015.71 centimeters of water.

747 mmHg is equal to 1015.71 cmH2O.
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Offline Borek

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Re:Barometric Pressure!
« Reply #4 on: October 21, 2005, 03:42:27 PM »
I did the same mistake at first, but I have found a time to think it over before hitting "post".

Mike never stated that the last number in his list is the equivalent of 747 torr, he just gave the conversion coefficients :)
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Offline mike

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Re:Barometric Pressure!
« Reply #5 on: October 21, 2005, 07:59:10 PM »
Yes, these are the conversion factors, not the actual answer to the question (sorry if that wasn't clear) :)
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