This is because Hg is an abbreviation of the Latin name of the element, which was hydrargium. With this name the Greeks were referring to the fact that mercury is a silvery liquid at room temperature, rather than a solid like other metals.
We've looked at the three types of heat transfer. Conduction and convection rely on temperature differences; radiation does, too, but with radiation the absolute temperature is important.
Heat is very friendly-it likes to move, transfer and travel. It does this by three main mechanisms: conduction, convection and radiation. Conduction is the transfer of heat through direct contact between different objects or substances.