Question

The local atmospheric pressure in Pullman is typically 93 kPa. A gage on a helium tank used for filling balloons reads a pressure of 150 kPa gage. What is the absolute pressure (abs) in the tank in kPa? What is the vacuum pressure in the tank in kPa?

Answer 1

absolute pressure is 243 kPa

vacuum pressure is - 150 kPa

Step-by-step explanation:

given data

atmospheric pressure = 93 kPa

gauge pressure = 150 kPa

to find out

absolute pressure and vacuum pressure

solution

we know that absolute pressure = atmospheric pressure + gauge pressure so equation will be

P (absolute ) = P (gauge) + P (atmospheric ) ...............1

and

vacuum pressure is = atmospheric pressure - absolute pressure

so equation will be

P ( vacuum ) = P (atmospheric ) - P (absolute ) .............2

so

from equation 1 absolute pressure will be

P (absolute ) = 150 + 93

absolute pressure is 243 kPa

and

from equation 2 vacuum pressure will be

P ( vacuum ) = 93 - 243

vacuum pressure is - 150 kPa