Na těleso v kapalině a v tíhovém poli za všech okolností musí působit tíhová síla a vztlaková síla , kde ρ je hustota kapaliny vytlačovaná tělesem. Proti pohybu tělesa směrem dolů působí vztlaková síla, platí tak:
Fvz = 0,00005 m3 · 1 000 kg · m−3 · 10 m · s−2 = 0,05 kg. 10 m · s−2 = 0,5 N.
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