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Line 48: − + − :<math>\rho_{\rm w} &= \mbox{water density}</math> − + − + − +
Hydrostatic pressure-depth plot construction (view source)
Revision as of 15:27, 30 January 2014
, 15:27, 30 January 2014→Calculating pressure gradients from water density: math
To calculate water pressure gradient (P<sub>grad</sub>), use the following formula:
To calculate water pressure gradient (P<sub>grad</sub>), use the following formula:
:<math>\mbox{P}_{\rm grad} = \mbox{ave. } \rho_{\rm w} \times 0.433 \mbox{ psi/ft}\end{align*}where:\begin{align*}\mbox{ave. } \rho_{\rm w} = \frac{\Sigma_{1}^{\rm n}\rho_{\rm w}}{\mbox{n}}</math>
:<math>\mbox{P}_{\rm grad} = \mbox{ave. } \rho_{\rm w} \times 0.433 \mbox{ psi/ft}</math>
where:
where:
* ave.ρ<sub>w</sub> = <math>\frac{\Sigma_{1}^{\rm n}\rho_{\rm w}}{\mbox{n}}</math>
* <math>\mathrm{ave.} \rho_\mathrm{w} = \frac{\Sigma_{1}^{\rm n}\rho_{\rm w}}{\mbox{n}}</math>
* ρ<sub>w</sub> = water density
* ρ<sub>w</sub> = water density
For example, given ave. ρ = 1.13, the equation works as follows:
For example, given ave. ρ = 1.13, the equation works as follows:
:<math>\mbox{P}_{\rm grad} = 1.13 \times 0.433 \mbox{ psi/ft} = 0.489 \mbox{ psi/ft}</math>
:<math>\mbox{P}_{\rm grad} = 1.13 \times 0.433 \mbox{ psi/ft} = 0.489 \mbox{ psi/ft}</math>