Enthalpy question
 

It's been a while since I thought about this, and I'm too lazy to go find my thermodynamics text book, so could someone remind me why water/steam at

1) 180 psia and 373.1°F, and
2) 32.75 psia and 317.5°F

both have an enthalpy of 1197.3 Btu/lbm*°R?

No.

triple point or critical point ?

One of your values is the same as critical point vs critical pressure for water.

Oooops, I hit the submit button too soon.
I needed to add: "I really don't have a clue"

Thanks LL - here's the answer.

http://upload.wikimedia.org/wikipedi...-_US_units.svg

I'm glad you found your answer.

Like I said, I really didn't have a clue.
It's been more than 50 yrs since I took PhysChem

I still say no. Mostly because that link heads nowhere.

I'm not having empathy for ur enthalpy. :rolleyes:

IM, I have the same problem.
I have more empathy for entropy than for enthalpy.

I used to work on the 3rd floor and the ice machine was in the basement.
I would tell people I was going to get some negative entropy.

:eek:

Let's recap: you have more empathy for entropy than you do for enthalpy, in fact, one might say that when it comes to enthalpy you feel apathy. Sorry if I'm being pithy. ;)

Not at all pithy. Maybe our enthalpy is just reaching supercritical.

Isn't it time to call in phlthy here?

I once posed this riddle to my friends:

What is the opposite of entropy?

hdoL+ua

The Cellar

Extropy, obviously.

Ice.

interesting answer.

Though there's less heat in ice there is greater order. A paradox.

The answer given to me by my friend was "Accounting". I liked his answer.

"My office is a high entropy area. It moves toward chaos faster than the rest of the universe."
--me

Think system, not ice cubes
Pete's example is a good one. ;)