×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*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.

# Coverting Latent Heat of Evaporation to mm of water evaporated

## Coverting Latent Heat of Evaporation to mm of water evaporated

(OP)
Hi

I am trying to understand a paper on the evaporation of water from bare soil. They have graphs of net radiation on the earth surface, latent heat of evaporation and soil heat flux. Below this is a graph comparing A Pan evaporation to Energy Balance evapotranspiration in cumulative mm of water lost.

My question is how do you get from Latent Heat of Evaporation to mm of water lost?

The total latent heat of evaporation over the day is 11.32MJ/m^2.

Regards

### RE: Coverting Latent Heat of Evaporation to mm of water evaporated

Google/Wikipedia says latent heat of fusion for water is 2260 kJ/kg

Since water has a density of 1000 kg/cubic meter,
LHF can also be expressed as 2260 MJ/cubic meter

A mm is 1/1000 depth of that CM, so LHF is 2.26 MJ per mm per m^2

11.32 MJ/m^2 should vaporize 5 mm

### RE: Coverting Latent Heat of Evaporation to mm of water evaporated

(OP)
Thanks a lot!

#### 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.

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!