Answer to Question #225635 in Molecular Physics | Thermodynamics for eren

Question #225635

A vacuum gage connected to a tank reads 30 kPa at a location where the barometric reading is 755 mm Hg. Determine the absolute pressure in kPa in the tank


1
Expert's answer
2021-08-12T11:02:25-0400

Vacuum gauge pressure= 30 KPa

Barometer reading =755 mm Hg

We know that the barometer always reads atmospheric pressure a given situation.

So atmospheric pressure is equal to 755 mm Hg.

We know that P=ρ×g×hP= ρ \times g \times h

Density of Hg = 13600 kg/m3

P=13600×9.81×0.755=100.72  kPaP=13600 \times 9.81 \times 0.755=100.72\; kPa

Absolute pressure=atmospheric pressure + gauge pressure

But here given that 30 kPa is a Vacuum pressure, so we will take it as negative.

Absolute pressure=atmospheric pressure + gauge pressure

Absolute pressure =100.7230=70.72  kPa=100.72 - 30 =70.72\; kPa

Answer: 70.72 kPs


Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be the first!

Leave a comment