|MadSci Network: Physics|
While not _absolutely_ sure, my best guess is Mercury. Mercury is a metal, but is actually a liquid at room temperature, and is very heavy, actually slightly heavier per cubic centimeter than Gold. I remember seeing a picture in National Geographic many years ago, of a mine in Spain where they dug Cinnabar, the ore that Mercury comes from. One of the miners was floating on top of a big pool of Mercury in a pit. He had a big smile on his face because he thought it was a big joke. He is probably dead now, because Mercury is also extremely poisonous. If you want to learn more about Mercury, check your encyclopedia, or ask your librarian to help you find The Handbook of Chemistry and Physics, and look for the section called The Elements. I hope this helps.
[added by MadSci Admin: Rick is right! Smithsonian Physical Tables
lists the surface tension of various liquids in contact with air (at room
temperature?)(in dynes per centimeter) as:
Olive Oil 35
Now, this same source also lists the surface tensions of metals at the temperature of their solidification:
Try the links in the MadSci Library for more information on Physics.