Why isn't pressure a measure of energy?

thermodynamics energy energy-conservation pressure
2,609

The pressure is higher, but the volume is less. The kinetic energy per particle stays the same, when compressing isothermally, there are just more particles per volume to "bounce on the walls", thus the higher pressure. Your higher pressure gas from your drilled cylinder could just do more work per volume, but since there is less volume available the total work stays the same!

Share:
2,609

Related videos on Youtube

bijan
Author by

bijan

Updated on August 01, 2022

Comments

  • bijan
    bijan 10 months

    Hey guys, I'm having a problem in understanding the 1st Law of Thermodynamics.

    If i would increase the pressure of a closed system by compressing a gas in a cylinder isothermal, the 1.Law states, that all the work i put in to the system, i get out by heat.

    So my 2.state would be the gas at the same temperature (same internal energy), but compressed (at a higher pressure).

    But isn't this compressed gas able to do more work, than the not compressed?
    If i drilled a hole in the cylinder my high pressure gas could do some work.

    Where does this energy come from, since all my input energy i put in by work, came out in form of heat?

  • bijan
    bijan over 12 years
    I got it. Thank You! isothermal = constant T = constant p*V ! :)

Recents

What age is too old for research advisor/professor?
How much solvent do you add for a 1:20 dilution, and why is it called 1 to 20?
How many weeks of holidays does a Ph.D. student in Germany have the right to take?
Why higher the binding energy per nucleon, more stable the nucleus is.?
What happen if the reviewer reject, but the editor give major revision?
Coordination number of 3D close packing
Why do universities check for plagiarism in student assignments with online content?
pKa = pH for strong acid — strong base?
Anonymous sites used to attack researchers. What to do about it?
Why does [Ni(gly)2] show optical isomerism despite having no chiral carbon?
I downoaded articles from libgen (didn't know was illegal) and it seems that advisor used them to publish his work
How do superwomen find time?

Related

A.M.>G.M. of four numbers
How to show AM-GM inequality using rearrangement inequality?
Proving that $\frac{ab}{c^3}+\frac{bc}{a^3}+\frac{ca}{b^3}> \frac{1}{a}+\frac{1}{b}+\frac{1}{c}$
Prove QM-AM inequality
Proofs of AM-GM inequality
If $a+b+c=6$ and $a,b,c$ belongs to positive reals $\mathbb{R}^+$; then find the minimum value of $\frac{1}{a}+\frac{4}{b}+\frac{9}{c}$ .
If $x^2 + y^2 + z^2 + 2xyz = 1$ then $x+ y+ z \leq \frac{3}{2}?$
How prove this inequality $\frac{x}{x+yz}+\frac{y}{y+zx}+\frac{z}{z+xy}\ge \frac{3}{2}$
How to prove that $b^2c^2+c^2a^2+a^2b^2 \gt abc(a+b+c)$
Prove that $\frac{1}{a^3(b+c)} + \frac{1}{b^3(a+c)} + \frac{1}{c^3(a+b)} \geq \frac{3}{2} \text{ when } abc=1$