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Tlen stanowi 21% powietrza:
24m³ --- 100%
x m³ ---- 21%
x = (24m³ * 21%) : 100% = 5,04m³ <---- objętość tlenu
Gęstość tlenu: d = 1.43kg/m³:
1,43kg --- 1m³
x kg --- 5,04m³
x = (1,43kg * 5,04m³) : 1m³ ≈ 7,21kg <---- masa tlenu