[/QUOTE="the horticulturist, post: 40994119, member: 100217"]
Soda has sugar and soup has salt (sour taste).
Already a different drink,that's biology on the taste structure of the tongue
[/QUOTE]
If I got you right, that means food tasting has nothig to do with surface tension ( a physics perspective ) rather it is a Biological perspective.
In physics, I recall, surface tensions of liquids changes inversely with temperature. How can a hot soup increase its surface tension, and the increase be the factor for good taste of the soup by the tongue ??!