TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

A nucleus whose aqueous solution has an equilibrium vapour pressure lower than that of pure water.  2, record 1, English, - hygroscopic%20nucleus

Record number: 1, Textual support number: 1 CONT

The exact form taken by hygroscopic nuclei is most frequently that of droplets of solution. It was established by Lord Kelvin that the vapour pressure over the surface of a water drop in equilibrium with its surroundings is greater than that over a plane water surface. ... The vapour pressure over the surface of a solution is always less than that over pure water at the same temperature. For this reason, a solution is hygroscopic, and absorbs water vapour from the surrounding air, becoming diluted in the process. From this it follows that nuclei in the form of droplets of solution may be expected to be satisfactory condensation kerns. When particles of hygroscopic substances are exposed to sufficiently damp air, they become droplets of solution.  3, record 1, English, - hygroscopic%20nucleus

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 DEF

Noyau dont la solution aqueuse a une pression de vapeur en équilibre plus basse que celle de l'eau pure.  2, record 1, French, - noyau%20hygroscopique

Record 1,  Textual support,  Spanish

Record number: 1, Textual support number: 1 DEF

Núcleo cuya solución acuosa tiene una presión de vapor en equilibrio más baja que la del agua pura.  2, record 1, Spanish, - n%C3%BAcleo%20higrosc%C3%B3pico

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

Small solid particles around which water condensates (cloud formation)  2, record 2, English, - hygroscopic%20nucleus

Record number: 2, Textual support number: 1 CONT

Condensation on hygroscopic nuclei may begin at a relative humidity much lower than 100 per cent (about 75 per cent for sodium chloride); while on so-called non-hygroscopic nuclei, which merely furnish sufficiently large (by molecular standards) wettable surfaces, relative humidities of nearly 100 per cent are required.  3, record 2, English, - hygroscopic%20nucleus

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Noyau de condensation, constitué par des solutions aqueuses de sels (chlorures de magnésium, de sodium, de calcium) ou d'acide (sulfurique, nitreux), intervenant dans la genèse des pluies.  2, record 2, French, - noyau%20hygroscopique

Record 2,  Textual support,  Spanish