The 10% of total volume of the barometer liquid (mercury) contains impurities having an average density 5 g cm-3. When this faulty barometer is used to measure the atmospheric pressure it reads 80 cm of the liquid column. Determine the correct atmo spheric pressure.

Asked by Sanjay | 28th Oct, 2020, 07:51: PM

Expert Answer:

10% of total volume of the barometer liquid (mercury) contains impurities 
Thus, Vol. of impurities= 0.1 V
Thus, volume of mercury = 0.9 V 
density =  mass/ volume 
Thus,
dl = (dmercury × 0.9 V + dimpurity × 0.1 V)/V 
Thus, pressure recorded by the standard barometer is, 
P1 = dy g hhg  ...(1)
Pressure by faulty barometer is
P2 = dl g h2 ...(2) 
Equating (1) and (2), 
hhg = 75 cm 
 
 

Answered by Shiwani Sawant | 29th Oct, 2020, 01:15: PM