What are the uses for element mercury?

Thermometers and Barometers mostly. Because of it's low melting point and high density, it's very sensitive to weather, therefore making it widely used in weather tools. It is also used in flourescent bulbs and street lights. Because it is a good conducter of electricity, it's used in tilt switches. These are the only uses i know of, I'm sure there is more just because mercury is such a cool element, but i hope this helped.