Energy req'd to compress a gas?

  • Context: High School 
  • Thread starter Thread starter ProtoBob
  • Start date Start date
  • Tags Tags
    Energy Gas
Click For Summary

Discussion Overview

The discussion revolves around the energy required to compress a gas, specifically air, from an initial volume of 100 ml to smaller volumes of 50 ml and 25 ml. The conversation touches on theoretical concepts related to gas behavior during compression, including isothermal and adiabatic processes.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant seeks guidance on calculating the energy required for gas compression at specified volumes.
  • Another participant notes that work is defined as force times distance and relates pressure to force per unit area, suggesting a connection to the energy calculation.
  • A participant proposes that if the initial pressure is 14.7 psi at 100 ml, then compressing to half the volume would result in a pressure of 29.4 psi.
  • It is mentioned that the energy required for compression will lie between two extremes: the minimum energy for isothermal compression and the maximum for adiabatic compression.
  • A participant requests clarification on the concepts of isothermal and adiabatic processes.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the specific energy calculations or the implications of isothermal versus adiabatic processes. Multiple viewpoints and approaches are presented without resolution.

Contextual Notes

The discussion includes assumptions about the behavior of gases under compression and does not resolve the mathematical steps needed to calculate the energy required for the specified compressions.

ProtoBob
Messages
6
Reaction score
0
Hi, I am trying to figure out how much energy would be required to compress air from 100ml
volume to 50ml, and also to 25ml volume...

A nudge in the right direction would be great!

Thank you! :)
 
Science news on Phys.org
Work is force times distance. Pressure is force per unit area. Pressure times volume of a gas is a constant. Enough of a nudge?
 
So if the volume were initially 100 ml and the pressure is 14.7 psi then when compressed to 1/2 the volume, would the pressure then be 14.7 * 2 = 29.4 psi?
 
The answer will liie between two extremesThe minimum energy is when the gas is compressed isothermally [infinitely slowly ]and the maximum when it is compressed adiabatically[infinitely rapidly].
 
Could you explain isothermally and adiabatically?
 

Similar threads

Replies
9
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 6 ·
Replies
6
Views
4K
  • · Replies 5 ·
Replies
5
Views
4K
Replies
14
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 5 ·
Replies
5
Views
4K
  • · Replies 20 ·
Replies
20
Views
3K
  • · Replies 109 ·
4
Replies
109
Views
9K
  • · Replies 8 ·
Replies
8
Views
5K