RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Mercury cooled to a solid. A sample of mercury in a beaker is cooled in a bath of liquid nitrogen until it freezes to a solid. Mercury is the only metal that is liquid at standard temperature and pressure. It has an extremely high surface tension and will form droplets that appear to roll around on hard surfaces. These properties have been exploited in its use in thermometers, float valves, switches and other devices. Mercury is also highly toxic. It is commonly known as quicksilver.
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