# plane as 63cm of HG while a ground observer records a reading of 75cm of...

Question 574
A
120m
B
138m
C
1200m
D
274m
E
120,000m
##### Explanation
Pressure change for air = pressure change for mercury

hpg = Hpg

h x 0.00136 x g = (75 - 63) x 13.6 x g

h $$\frac{12 \times 13.6}{0.00136}$$

= 120,000

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