What is the most electrically and thermally conductive metal/alloy that is a liquid at 50C

Mercury must be high on the list. It is used in mercury arc rectifiers which work at high current and/or voltage levels.

I couldn't find one that was liquid below 70C. Mercury is the only one I know.

Edited August 8, 20169 yr by StringJunky

Gallium.

It could also be alloys like Zinc and mercury or gallium and aluminium or like NaK, I just dont know which one of these would work best

Gallium.

Right

Cs and Rb are liquids at 50 ºC

NaK is liquid below room temperature, Galinstan too.

"41% Cs, 47% K, and 12% Na has the lowest melting point of any known metal alloy, at -78 °C" (Wiki about caesium)

 

78%K 22%Na resists 410nohm*m at RT.

Hg resist 961nohm*m at RT.

 

I don't have at hand the resistivity of Ga-In nor Ga-In-Sn (Galinstan). Compare the heat conductivity if the electric one isn't available.

 

NaK reacts with water and humidity.

Hg emits toxic vapours.

Ga-In and Ga-In-Sn are the most civilized.

 

Consider that about any liquid metal is corrosive to solid metals and to some ceramics. For instance Hg amalgamates Al and most metals, Ga botches steel just by contact, and so on.