Compressibility factor for water

[dursosono]

Dear All,
I need the value of compressibility factor for water with restricted pressure 1000 psig or below.
Thanks for any valuable replay

 

[Drexl]

According to wiki

http://en.wikipedia.org/wiki/Water_(molecule)#Compressibility

around 5.1e?10 Pa^?1

 

[zdas04]

According to a number of references that I had to find for a project recently, the volumetric contraction of water is 0.2% per 1,000 psi. So if you have 1,000 gallons of daerated water at atmospheric pressure, you would have to add 2 gallons of water to reach 1,000 psia or 4 gallons to reach 2,000 psia, etc.

Drexl's number from wiki is 0.36%/1000psi. I found similar numbers to that for hydraulic oil, but the most common number I found for water was around 0.2%/1000 psi. For the project I was working on, that would have mattered. For pressures under 1,000 psig I don't think the difference matters.

David

 

[BigInch]

For liquids its more conventional to talk about their Bulk modulii, which for water (at STP) is 312,000 psi.

The bulk modulus K can be formally defined by the equation:
K = -V [∂]P/[∂]V

where P is pressure, V is volume, and ?P/?V denotes the partial derivative of pressure with respect to volume. Compressibility of water is 1/K = 0.003205 in2/lb
or in this case 3.205/1000 psi, getting pretty close to zdas' value.

**********************
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[dursosono]

Hi,
Thank's all for some precious feedback.