Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Latent Heat of Vaporization Equation

Latent Heat of Vaporization Equation

Latent Heat of Vaporization Equation

Hi All,

I'm trying to calculate the latent heat of vaporization of a chemical using the equation found in Perry's Chemical Handbook, Table 2-150. It gives the latent heat equation and chemical specific constants. My issue is I can't get that equation, which outputs J/kmol, to convert correctly to BTU/lb. I tried using water as a test chemical to make sure I was using the equation correctly, and it won't work.

The table says the listed are "latent heat values at Tmin X 1E-07". For water, this comes out to (and is listed as)4.4733x10^-7 J/kmol at 0C.

Does anyone have experience with using this equation from Perry's or converting it to BTU/lb?


RE: Latent Heat of Vaporization Equation

The tabulated value for water should be multiplied by 107 since it has been given as multiplied by 10-7. Therefore, the reading should be 4.4733×107 J/kmol.

To get J/g = kJ/kg, divide this value by 18,015 g/kmol.
The conversion from kJ/kg to Btu/lb is an easy operation.

RE: Latent Heat of Vaporization Equation

You may use:
1 Btu/lb = 2.326 kJ/kg

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - Considerations for choosing a 3D printing technology
The adoption of 3D printing into major companies’ product development life cycles is a testament to the technology’s incredible benefits to consumers, designers, engineers and manufacturers. While traditional production methods have limitations in manufacturability, 3D printing provides unparalleled design freedom due to the additive method of building parts layer by layer. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close