- #1
georg gill
- 153
- 6
The work in a system is given by
[tex]F\cdot\Delta h[/tex]
[tex]P\cdot A\cdot\Delta h[/tex]
[tex]P\cdot \Delta V[/tex]
when one calculate work one always uses pressure from surroundings. Why is it so. I get that work becomes linear then because p is constant but I thought that if one use Newtons third law that a system is standing still if forces are equal then work as a physical change would be done if p is larger in either system or surroundings. But if one look at force from system when p is larger in system why can't one use that to calculate work on surroundings?
[tex]F\cdot\Delta h[/tex]
[tex]P\cdot A\cdot\Delta h[/tex]
[tex]P\cdot \Delta V[/tex]
when one calculate work one always uses pressure from surroundings. Why is it so. I get that work becomes linear then because p is constant but I thought that if one use Newtons third law that a system is standing still if forces are equal then work as a physical change would be done if p is larger in either system or surroundings. But if one look at force from system when p is larger in system why can't one use that to calculate work on surroundings?