- #1
El Moriana
- 33
- 0
Hi,
I'm trying to figure out the pressure exerted by a compressible gas (air) after it has expanded out of a cylinder for a simple conceptual design. I'm pretty sure that it's a simple problem, but I'm a little thickheaded atm. Here is my thinking so far:
Due to the compressibility of air, I assume that I cannot use the ideal gas model, hence
P1V1=P2V2 (assuming an isothermic expansion) cannot be used.
Instead, factoring in for compressibility, I get:
P1V1Z1=P2V2Z2 (again assuming isothermic expansion)
I know the cylinder used and expansion chamber and so I know P1, V1 and V2 and can calculate Z1.
This leaves me with two unknowns - P2 and Z2 - but only one equation. How do I get the second equation to solve this?
I'm trying to figure out the pressure exerted by a compressible gas (air) after it has expanded out of a cylinder for a simple conceptual design. I'm pretty sure that it's a simple problem, but I'm a little thickheaded atm. Here is my thinking so far:
Due to the compressibility of air, I assume that I cannot use the ideal gas model, hence
P1V1=P2V2 (assuming an isothermic expansion) cannot be used.
Instead, factoring in for compressibility, I get:
P1V1Z1=P2V2Z2 (again assuming isothermic expansion)
I know the cylinder used and expansion chamber and so I know P1, V1 and V2 and can calculate Z1.
This leaves me with two unknowns - P2 and Z2 - but only one equation. How do I get the second equation to solve this?