Modelová Otázka ID 3386 - 
Na čem závisí či nezávisí tlak syté páry nad kapalinou v uzavřené nádobě?
Správná odpověď je: A, D
Sytá pára je taková pára, která je v rovnovážném stavu s kapalinou, z níž vzniká. V rovnovážném stavu nadále dochází k přechodu molekul z kapalné fáze do plynné, rychlost zpětného přechodu molekul je však stejná. Jedná se tedy o dynamickou rovnováhu. Při zvýšení teploty tlak syté páry roste, protože se zvyšuje vnitřní energie molekul tvořících páru. Tlak syté páry není závislý přímo úměrně na povrchovém napětí kapaliny, stejně tak není závislý na objemu prostoru, v němž se sytá pára tvoří. Objem prostoru nad kapalinou má význam pouze před vytvořením rovnováhy a syté páry, neboť tlak syté páry je pro danou teplotu konstantní.
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