Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

A perfect storm in a cup of salt water?

  1. Sep 21, 2010 #1
    Hi all:

    I have been puzzled by a very simple experiment I did lately. I found there exists a temperature gradient in a cup of saturated salt water--the bottom is about 0.5 Celsius warmer than the top. That is after the solution has been left intact for more than 100 hours. There is no such temperature gradient in a cup of pure water or unsaturated salt water.

    I documented these experiments in my blog:

    http://molecularworkbench.blogspot.com/2010/09/why-is-bottom-of-cup-of-salty-water.html
    http://molecularworkbench.blogspot.com/2010/09/evaporation-is-driving-force.html
    http://molecularworkbench.blogspot.com/2010/09/temperature-gradient-only-exists-in.html

    I am going to continue my experiments to figure out why. In the meantime, can anyone enlighten me?

    Charles Xie
     
  2. jcsd
  3. Sep 23, 2010 #2
  4. Sep 23, 2010 #3

    Mapes

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Nice!
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook