Updated September 21, 2004

Indium is often used in alloy solders. Pure indium is rarely used, but indium sheets make a useful "tweaking" material for temporarily tuning thin-film circuits since it sticks pretty well to gold thin-films when carefully squashed down with a wood toothpick or similarly expensive tool. Where else but Microwaves101 would you learn stuff like that?

Formula or Composition:	In
Bulk Resistivity:	15.52 -cm
Temperature Coefficient of Resistivity (TCR):	33000? ppm/°C
Mass Density:	7.3 gr/cc
Heat Capacity:	238.7 J/kg/°C
Thermal Conductivity (k):	80.0 W/m°C
Temperature Coefficient of Expansion (TCE):	33 ppm/°C
Melting Point, °C:	157 °C
Melting Point, °F:	314 °F