Re: experimental latent heat of evaporation

[Bob LaMontagne <rlamont@POSTOFFICE.PROVIDENCE.EDU>]

The enthalpy of vaporization (latent heat) is

80C      2308.8 kJ/kg
100C    2157.1 kJ/kg

from Wark & Richards: Thermodynamics  6th Ed.  p111.  No info about the
affect of the bubbles.


Bob at PC

*********** REPLY SEPARATOR  ***********

On 9/28/2004 at 10:28 AM Ludwik Kowalski wrote:

> On Tuesday, Sep 28, 2004, Herbert H Gottlieb wrote:
>
> > My high school students were able to measure the latent heat of
> > vaporization of water to be 527 calories/gram. This is only a 2.4%
> > error from the standard 540 cal.g.
> >
> > It was done in a covered, styrofoam cup partially filled with water.
> > Steam at 100 degrees C was added by a rubber hose from a
> > standard laboratory steam generator. . . .
>
> Do you think that this good method can answer my question? I want to
> know if L of boiling water is different from the L of water that
> evaporates without boiling, for example at 80 C.
> Ludwik Kowalski