10 μl destilované vody za normálních podmínek odpovídá hmotnosti:
Správná odpověď je: B, C
Hustota destilované vody je za normálních podmínek přibližně:
ρ = 1000 kg · m−3 = 1 g · cm−3.
Jeden litr vody odpovídá 1 000 cm3. Jestliže je tedy hmotnost 1 litru destilované vody:
1 000 gramů = 1 kilogram a 1 μl (mikrolitr) = 10−6 l (litru),
pak 10 μl destilované vody váží za normálních podmínek přibližně 10−5 kg. A jelikož:
1 kg = 103 g = 106 mg,
je správně také odpověď C.
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