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A property of Thermodynamic system measuring a change of internal energy $\begin{array}{l}U\end{array}$ with respect to the change of its volume $\begin{array}{l}V\end{array}$ :

(1)	$\begin{array}{l}\displaystyle p = - \left( \frac{\partial U}{\partial V} \right)_{S, N}\end{array}$

with entropy $\begin{array}{l}S\end{array}$ and number of particles $\begin{array}{l}N\end{array}$ being constant.

It is related to mechanical pressure and measures in the same units:

Symbol

Additional

$\begin{array}{l}p\end{array}$

M L^-1 T^-2

Pa

kPa = 10³ Pa = 0.145038 psi

MPa = 10³ Pa = 145.038 psi

GPa = 10⁶ Pa = 145,038 psi

psi = 6894.76 Pa = 6.89476 kPa

bar = 10⁵ Pa = 100 kPa = 14.5038 psi

atm = 101,325 Pa = 101.325 kPa = 14.6959 psi

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See also

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Pressure (thermodynamic property)

See also