Answer the following questions (assume standard atmospheric pressure): a. For a

Question

Answer the following questions (assume standard atmospheric pressure): a. For a vacuum pressure of 30 kPa, what is the absolute pressure? Gage pressure?
b. For a pressure of 13.8 psig, what is the pressure in psia?
c. For a pressure of 200 kPa gage, what is the absolute pressure in kPa?
d. Give the pressure 100 psfg in psfa. Answer the following questions (assume standard atmospheric pressure): a. For a vacuum pressure of 30 kPa, what is the absolute pressure? Gage pressure?
b. For a pressure of 13.8 psig, what is the pressure in psia?
c. For a pressure of 200 kPa gage, what is the absolute pressure in kPa?
d. Give the pressure 100 psfg in psfa. Answer the following questions (assume standard atmospheric pressure): a. For a vacuum pressure of 30 kPa, what is the absolute pressure? Gage pressure?
b. For a pressure of 13.8 psig, what is the pressure in psia?
c. For a pressure of 200 kPa gage, what is the absolute pressure in kPa?
d. Give the pressure 100 psfg in psfa.

Explanation / Answer

here

the standard atmospheric pressure is = 101325 pa

a)

vacuum pressure = 30 * 10^3 pa

we use the formual

absolute pressure = atmospheric pressure - vaccum pressure

absolute pressure = 101325 - 30000 = 71325 Pa

then

gage pressure = absolute presssure - atmospheric pressure

gage pressure = 71325 - 101325 = -30000 Pa

b)

the pressure 13.8 psig is same in psia

so it is = 13.8 psia

c)

here also we use the same formula of gage pressure

absolute pressure = atmospheric + gage

absolute pressure = 101325 + 200 * 10^3

absolute pressure = 301325 = 30.1325 * 10^4 Pa

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