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Re: manometers
Re: manometers -- ex03134	Post Reply	Top of thread	Forum

Posted by: ex03134 ® 12/04/2005, 10:12:20 Author Profile Mail author Edit

sorry..its kg/m^3

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Re: manometers
Re: manometers -- ex03134	Post Reply	Top of thread	Forum

Posted by: devitg ® 12/03/2005, 20:16:18 Author Profile Mail author Edit

please especify the units used . 809 what???

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Re: manometers
Re: Re: manometers -- devitg	Post Reply	Top of thread	Forum

Posted by: Georgezx9 ® 12/05/2005, 07:50:21 Author Profile Mail author Edit

It is simply a direct ratio of the densities. (assume fresh water is 1, or 1000kg/m^3) 1mm water gauge equates to 0.809mm of meths. i.e 1mm meths is 1.2mm water gauge

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Re: manometers
Re: Re: manometers -- Georgezx9	Post Reply	Top of thread	Forum

Posted by: ex03134 ® 12/06/2005, 06:28:38 Author Profile Mail author Edit

hi thanx for the reply, but u ddnt consider the change from inches to mm..so for example if i had 4inches of methylated spirit, do i multiply it by 25.6 (mm in 1 inch) and then multiply that by the ratio between methylate spirit and water? because thats what i did but i'm not sure if thats correct.

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manometers
Re: Re: manometers -- Georgezx9	Post Reply	Top of thread	Forum

Posted by: devitg ® 12/05/2005, 08:18:40 Author Profile Mail author Edit

Hi , I'm sorry to say it is not so . For water 1000Kg/m3 we have aprox 10000 mm for 1 atmsphere or 1 BAR For mercury ,13000 Kg/m3 we have about 760 mm for 1 Bar So, if the liquid is ligther we need MORE mm to equal the pressure. In this case the factor is 1/0.860 = 1.1627 So you need 1.1627 mm of meths to equal 1 mm of water Or 0.860 mm of water to equal 1 mm of meths.

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