Answer:
Absolute pressure=70.72 KPa
Explanation:
Given that Vacuum gauge pressure= 30 KPa
Barometer reading =755 mm Hg
We know that barometer always reads atmospheric pressure at given situation.So atmospheric pressure is equal to 755 mm Hg.
We know that P= ρ g h
Density of [tex]Hg=13600 \frac{kg}{m^3}[/tex]
So P=13600 x 9.81 x 0.755
P=100.72 KPa
We know that
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=100.72 - 30 KPa
So
Absolute pressure=70.72 KPa
The absolute pressure in this tank at an atmospheric pressure of 755 mmHg is equal to 70.658 kPa.
Given the following data:
Vacuum pressure = 30 kPa.
Atmospheric pressure = 755 mmHg.
In order to determine the absolute pressure in this tank, we would first of all conver the value for the atmospheric pressure in mmHg to kPa.
Conversion:
1 mmHg = 0.1333 kPa.
755 mmHg = 100.658 kPa.
Mathematically, absolute pressure is given by this formula:
[tex]P_{abs}=P+\rho gh\\\\P_{abs}=P_{atm}-P_{vacuum}[/tex]
Substituting the given parameters into the formula, we have;
[tex]P_{abs}=100.658-30\\\\P_{abs}=70.658[/tex]
Absolute pressure = 70.658 kPa.
Read more on absolute pressure here: brainly.com/question/10013312
