Department of Energy Argonne National Laboratory Office of Science NEWTON's Homepage NEWTON's Homepage
NEWTON, Ask A Scientist!
NEWTON Home Page Visit Our Archives Ask A Question How To Ask A Question Question of the Week NEWTON Teachers Our Expert Scientists Volunteer at NEWTON! Referencing NEWTON Frequently Asked Questions About Ask A Scientist About NEWTON Education At Argonne Water Loss by Breathing

Name: Joe
Status: other
Grade: 12+
Location: Outside U.S.
Country: USA
Date: Spring 2013

In an average eight hour sleep period ,normal home, how much moisture would a 200 lb man lose in ounces of water by breathing only?

Hi Joe,

Thanks for the question. The rule of thumb that I have remembered is that one loses half a cup of water per day by breathing. Of course, this is only approximate. So, I would expect that a person might lose one-third to one-half of a cup of water by breathing during an eight hour sleep period.

I hope this helps. Please let me know if you have more questions. Thanks Jeff

Click here to return to the Zoology Archives

NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.

For assistance with NEWTON contact a System Operator (, or at Argonne's Educational Programs

Educational Programs
Building 223
9700 S. Cass Ave.
Argonne, Illinois
60439-4845, USA
Update: November 2011
Weclome To Newton

Argonne National Laboratory