Modelová Otázka ID 3393 - 
Který z následujících vzorců správně vyjadřuje vztah mezi hydrostatickým tlakem kapaliny a kapilárním tlakem téže kapaliny v úzké kapiláře, do níž kapalina vystoupila a jejíž stěny smáčí, přičemž v kapiláře kapalina díky povrchovému napětí vytváří povrch tvaru kulového vrchlíku?
Správná odpověď je: A
Pro kapilární tlak kapaliny s 1 volným povrchem platí vzorec 
. Pro hydrostatický tlak v kapiláře platí vzorec 
. Kapalina v kapiláře vystoupá právě do takové výšky, kdy se kapilární tlak a hydrostatický tlak kapaliny rovnají, platí tedy:
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