Atmospheric pressure at the surface of the Earth is supported by a column of mercury approximately 76 cm tall. The equivalent height of a **water** column is approximately (density Hg = 13.6 × 10³ kg/m³, water = 10³ kg/m³):
A7.6 m
B10.34 m
C20.7 m
D76 cm
Answer & Solution
Correct answer: B. 10.34 m
$h_{Hg}\rho_{Hg} = h_{water}\rho_{water}$. $h_{water} = 0.76 \times 13.6 = 10.34$ m. (That's why you can't suction water more than ~10 m up a straw.)
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