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This page provides a simple browsing interface for finding entities described by a property and a named value. Other available search interfaces include the page property search, and the ask query builder.

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• Pressure  + ('''Pressure''' is a fundamental quantity e … '''Pressure''' is a fundamental quantity expressing energy per volume. The SI unit of pressure is generally pascal [Pa] = [J·m^-3]. The term 'stress' (mechanical stress) is used as a synonym for pressure ([[Bureau International des Poids et Mesures 2019 The International System of Units (SI) |SI]]). Pressure is known in physics as mechanical pressure, which is force per area, ''p'' = ''F''·''A''^-1 [Pa] = [N·m^-2]. In physical chemistry, gas pressure is defined as ''p'' = ''n''·''V''^-1·''RT'', where the [[concentration]] is ''c'' = ''n''·''V''^-1 [mol·m^-3], ''R'' is the [[gas constant]], and ''T'' is the absolute temperature, and ''RT'' is expressed in units of chemical force [J·mol^-1]. van't Hoff's osmotic pressure assumes the same form applied to dissolved substances diffusing across a semipermeable membrane, but concentrations should be replaced by [[activity |activities]]. The activity of dissolved gases is expressed by the [[partial pressure]], where the [[solubility]] can be seen as an activity coefficient. Pressure appears explicitely or implicitely in all chapters of physics and physical chemistry. In contrast to the universal counterparts energy and force, however, the general connections between various isomorphic expressions of pressure remain poorly understood: Pressure is the concentration of the [[force]] at the point of [[action]]. More generally, pressure is the force times concentration at the interphase of interaction.]]. More generally, pressure is the force times concentration at the interphase of interaction.)

• Pressure  +