Need help understanding this question

[naim]

Homework Statement

Dry steam is compressed isothermally from a pressure of 1 bar to 4 bar. if the initial volume is 0.5 m^3, calculate the volume of the steam after compression

Homework Equations

Dont know

The Attempt at a Solution

 

[tiny-tim]

Dry steam is compressed isothermally …

it means with the temperature staying constant

(from the greek "iso-", meaning "same")

 

[naim]

so how do i calculate it , does anyone know the equation of how to do it?

 

[pm35]

Since this is dry (completely vapor state) you could model with the ideal gas law

PV=nRT

since it is isothermal T is does not change, therefore: n,R, and T are all constant and the right side of the equation is the same before and after compression, so
P1V1=P2V2

V2 = (P1V1)/P2 , plug and chug

 

[naim]

do i convert the 1 bar ? or do i just keep it as
v2=(1x0.5)/4 ?

 

[Astronuc]

Homework Statement

Dry steam is compressed isothermally from a pressure of 1 bar to 4 bar. if the initial volume is 0.5 m^3, calculate the volume of the steam after compression

Homework Equations

Dont know

The Attempt at a Solution

Is there anymore information, e.g., the temperature, or the amount of superheat? Using the ideal gas law, or Boyle's law would be appropriate for an approximation. If the temperature is at a saturation level between 1 bar and 4 bar, then at the intermediate pressure, there would be some condensation (vapor to liquid transformation).

 

[naim]

no that was all the information that was given