
Figure above shows a simple barometer. Find the atmospheric pressure in the unit of
a) cmHg
b) Pa
[Density of mercury = 13,600 kgm-3]
Answer:
a)
The atmospheric pressure,
P = 76cmHg
b)
The atmospheric pressure,
P = hρg
P = (0.76)(13,600)(10) = 103,360 Pa