In [1]:

```
#Variable declaration
patm = 14.5 ; # atmospheric pressure in psia
pgauge = 2.5; # gauge pressure in psia
A = 10; # Area of the piston in in^2
g=9.80665; # Acceleration due to gravity in m/s^2
#Calculation for (a)
p = patm + pgauge; #total pressure of gas
m=(p-patm)*A ; # mass of the piston
#Result for (a)
print "In English units"
print "Mass of the piston =",m,"lbm"
#Calculation for (b)
p=(p*0.454*g)/(0.0254**2); # conversion of English unit to SI units
patm=(patm*0.454*g)/(0.0254**2); # conversion of English unit to SI units
m = ((p-patm)*(A*2.54**2*10**-4))/g; # Mass of the piston
#Result for (b)
print "\nIn SI units \n","Mass of the piston =",m,"kg"
```

In [2]:

```
import math
#Variable declaration
d_r = 13600; # Density of manometric fluid (mercury) in kg/m^*3
g = 8.92; # Gravitational acceleration in m/s^2
#Variable declaration
z1=0.589*math.sin(math.radians(60)); # vertical height of fluid at section 1
z2=2*math.sin(math.radians(30)); # vertical height of fluid at section 2
z=z2-z1; # Difference in vertical heights of fluid
patm = 14.7; # Atmospheric pressure in lbf/in^2
patm=(patm*4.44822*144/0.3048**2); # conversion of lbf/in^2 unit to N/m^2 unit
p=patm + (d_r*g*(z2-z1)); # Balance of force at A
#Result
print "Difference in vertical heights of fluid = ",round(z,2),"m"
print "\nThe pressure of fluid in the vessel = ",round(p/1000,0),"kPa"
```