TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

... a measure of the tendency of water to move from high free energy to lower free energy.  3, record 1, English, - water%20potential

Record number: 1, Textual support number: 1 CONT

Water potential is the sum of osmotic potential, pressure potential, [gravitational potential,] and matric potential.  4, record 1, English, - water%20potential

Record number: 1, Textual support number: 2 CONT

For historical and practical reasons, however, plant physiologists have developed another parameter called the water potential (psi_w). Water potential is expressed in pressure units such as megapascals (MPa). ... Like chemical potential, water potential is a relative quantity, and is always determined as a difference between the sample in question and a standard reference. For plant physiologists, the standard reference for water potential measurements is the water potential of pure water at one atmosphere of pressure. This reference value is defined as 0 MegaPascals.  2, record 1, English, - water%20potential

Record number: 1, Textual support number: 1 OBS

[Water potential] is replacing the concept of osmotic pressure and differs from osmotic pressure in taking capillary and imbibitional forces into account.  4, record 1, English, - water%20potential

Record number: 1, Textual support number: 2 OBS

The symbol for water potential is the Greek letter Psi. ... Water potential is measured in units of atmospheric pressure; bars or dynes per square centimeter. (1 bar = 106 dynes/cm²).  3, record 1, English, - water%20potential

Record number: 1, Textual support number: 3 OBS

The symbol used is the Greek letter psi_w.  5, record 1, English, - water%20potential

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

Les composantes du potentiel hydrique. Dans un sol, l'énergie potentielle de l'eau peut provenir de plusieurs sources. [...] Potentiel gravitationnel [...] Potentiel matriciel [...] Potentiel osmotique [...]  2, record 1, French, - potentiel%20hydrique

Record number: 1, Textual support number: 1 OBS

Paramètre de l'eau du sol ou de la plante.  3, record 1, French, - potentiel%20hydrique

Record number: 1, Textual support number: 2 OBS

Bien qu'aujourd'hui le terme potentiel hydrique soit le terme recommandé, on trouve encore, héritage du passé, d'autres appellations de cette même grandeur : potentiel de succion, tension de succion, déficit de pression, hauteur capillaire, etc. Le fait à retenir est que ces différentes dénominations, qu'il faut désormais éviter d'utiliser en physiologie végétale et en agronomie, sont le plus souvent équivalentes (au signe près et compte tenu des unités dans lesquelles elles sont exprimées); elles définissent toutes «l'état énergétique» de l'eau dans un substrat.  4, record 1, French, - potentiel%20hydrique

Record 1,  Textual support,  Spanish

Record number: 1, Textual support number: 1 DEF

Gradiente de presión que provoca el flujo de agua, especialmente en relación a su absorción del suelo por las plantas.  1, record 1, Spanish, - potencial%20h%C3%ADdrico

Record number: 1, Textual support number: 1 OBS

Depende de los componentes gravitatorios, matricial, osmótico y de presión.  1, record 1, Spanish, - potencial%20h%C3%ADdrico

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 CONT

The chemical potential of water is a quantitative expression of the free energy associated with the water. It is important to note that the chemical potential is a relative quantity. It is always expressed as the difference between the potential of a substance in a given state and the potential of the same substance in a standard state. The unit of chemical potential is energy per mole of substance (joules per mole).  2, record 2, English, - water%20potential

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Travail à exercer sur l'unité de masse d'eau pour la faire passer d'un état de référence (eau libre) à l'état de liaison qu'elle a dans un système considéré (sol plus ou moins sec, organe vivant ou mort, solution plus ou moins concentrée).  1, record 2, French, - potentiel%20hydrique

Record 2,  Textual support,  Spanish