Modelová Otázka ID 3362 - 
Podle jakého vzorce lze vypočítat kapilární tlak, jestliže kapalina tvoří v kapiláře volný povrch ve tvaru kulového vrchlíku?
Správná odpověď je: A
Vzorec pro výpočet kapilárního tlaku je závislý na počtu povrchů kapaliny v dané soustavě. Kapalina v kapiláře má 1 volný povrch, pro výpočet jejího kapilárního tlaku tak platí: 
, kde σ je povrchové napětí kapaliny a r je poloměr kapiláry. Pokud by kapalina měla 2 volné povrchy (například vzduchová bublina), vzorec pro výpočet kapilárního tlaku by pak vypadal následovně: 
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