Real Gas vs Ideal Gas: Compressibility Ratio

  • Context: Undergrad 
  • Thread starter Thread starter 101nancyma
  • Start date Start date
  • Tags Tags
    Gas Ideal gas Real gas
Click For Summary
SUMMARY

The compressibility ratio of a gas, defined by the equation PV/nRT, decreases when the attractive forces between gas molecules increase. This occurs because increased molecular interactions reduce the pressure exerted on the container, leading to a lower compressibility ratio. Although the real gas equation indicates that real volume increases and real pressure decreases, it is essential to consider temperature changes when analyzing these variations. Thus, the relationship between pressure, volume, and temperature is critical in understanding compressibility in real gases.

PREREQUISITES
  • Understanding of the Ideal Gas Law
  • Familiarity with real gas equations
  • Knowledge of thermodynamic principles
  • Basic concepts of molecular interactions
NEXT STEPS
  • Study the Van der Waals equation for real gases
  • Explore the effects of temperature on gas behavior
  • Investigate the concept of compressibility factor (Z)
  • Learn about the relationship between intermolecular forces and gas properties
USEFUL FOR

Students of thermodynamics, physicists, and chemists interested in the behavior of gases under varying conditions, particularly those studying real gas behavior and compressibility.

101nancyma
Messages
8
Reaction score
0
The compressibility ratio of a gas is PV/nRT. What happen to the compressibility ratio if the attration force between the gas molecules increase? The answer says it decreases because the more molecules interact with each other, so the pressure they exert on the container decreases, thus compressibility ratio decreases. The part I don't understand is according to the real gas equation, real volume increases, and real pressure decreases. If it is true, then shouldn't the compressibility ration remain the same?
 
Science news on Phys.org
You must note that though what you have thought is true, you have forgotten that when there is a change (delta) in the pressure and volume, you have to take into account the temperature change as well.
 

Similar threads

Undergrad Yet again about (real) gas compression
  • · Replies 20 ·
Replies
20
Views
3K
Undergrad Compressing gas with piston: reasons for temperature increase?
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Variation of air temperature with altitude
  • · Replies 28 ·
Replies
28
Views
3K
Undergrad Why pressure stays the same when doubling both volume and temperature?
  • · Replies 35 ·
2
Replies
35
Views
5K
High School Energy seems to disappear when gas is compressed?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Heat capacity for a real gas using the ideal gas (zero pressure) equation
  • · Replies 32 ·
2
Replies
32
Views
4K
Undergrad Thermodynamics and ideal gas law concepts
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Why is estimation of ##\frac{Pv}{RT}=1+BP+CP^2+...## interesting?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Adiabatic compression of piston and finding the velocity ratio of gas
  • · Replies 0 ·
Replies
0
Views
2K
Undergrad How to calculate the mass of gas in a tank?
  • · Replies 109 ·
4
Replies
109
Views
8K