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I am an engineer learning physics in my spare time. My current focus is quantum field theory and the Standard Model.


Sep
24
awarded  Autobiographer
Aug
24
comment Is Fourier's law of conduction a consequence of the second principle?
@Nikos: Would you have a reference textbook to suggest for me to explore this question?
Aug
21
accepted Is Fourier's law of conduction a consequence of the second principle?
Aug
21
comment Is Fourier's law of conduction a consequence of the second principle?
I find it suprising that we need to have two independent laws that imply that heat moves from hot to cold, in a non-reversible way. What would be the minimum additional assumption that would allow derivation of Fourier's law?
Aug
21
asked Is Fourier's law of conduction a consequence of the second principle?
Aug
13
answered What is the effect of an increase in pressure on latent heat of vaporization?
Aug
8
comment Why should mass be attractive in nature?
Isn't it provable that spin 2 particles like the graviton generate attractive forces between object of similar charge?
Aug
7
comment Stability of the hydrogen atom and positronium
Perhaps I should have said 'simple' process rather : tree-level or one loop order. Positronium annihilation is straightforward to write using simple Feynman diagrams, But I was not able to write one for quark and electron, and I was wondering if one reason was the lack of interaction vertex between up quark (charge +2/3) and electron (-1).
Aug
6
accepted Stability of the hydrogen atom and positronium
Aug
6
asked Stability of the hydrogen atom and positronium
Aug
5
accepted Why did the Homestake experiment only detect solar neutrinos?
Aug
5
asked Why did the Homestake experiment only detect solar neutrinos?
Aug
5
comment Why do liquids boil when their vapor pressure equals the ambient pressure?
Perhaps I should rephrase that. What I meant to say is that the bubbles that can be observed before the water is hot enough for boiling are composed of dissolved air gases.
Aug
5
answered Why do liquids boil when their vapor pressure equals the ambient pressure?
Jul
30
answered Can we apply $pV^\gamma$=const only for quasistatic adiabatic process?
Jul
24
comment Thoughts on the ice cube from orbit problem
I used this search: wolframalpha.com/input/?i=enthalpy+of+ice+at+0+kelvin+and+0+bar
Jul
24
comment Thoughts on the ice cube from orbit problem
Enthalpy of formation yes, but the reference point does not matter, does it? The enthalpy difference should give us an estimate of the total energy required to turn the ice into steam. I'm surprised there's such a difference between your result and what I'd expect from looking up an enthalpy table.
Jul
24
comment Thoughts on the ice cube from orbit problem
Wolframalpha lists the enthalpy of ice at 0K and 0bar as $-205158 kJ/kg$ while steam at 1bar is $2676 kJ/kg$, for a difference of about $208 MJ/kg$. Any idea where the difference comes from ?
Jul
23
comment Calculation of pressure from flow rate of water
Potential duplicate with physics.stackexchange.com/q/126583
Jul
23
comment Energy comparison, evaporate water vs compress air, same mass
As you point out in your other calculation, the work of compression is very dependent on the actual process. Isothermal compression will give a lower bound, but the compression of such a small volume of air is likely to be adiabatic.