# Is there a metal that melts and solidifies quickly?

Is there any kind of metal that melts very quickly with very low heat or temperature, and at the same time, becomes hard very quickly?

• Mercury is liquid at room temperature and gallium melts in your hand: youtube.com/watch?v=HMekQGnnQjI . But this just addresses melting points, I'm not sure what you mean by 'quickly' - the heat dispersion rate? Solder works good for this, if you don't mind the 300 degrees or so it takes to melt it. – Ehryk Apr 16 '14 at 0:30

The melting points of some eutectic mixtures are tabulated in an article by French.1 Some options for low-melting point metals/mixtures are:

• Gallium-indium eutectic, mp 15.7 °C (Sigma-Aldrich catalogue)
• Galinstan, mp –19 °C (Wikipedia article)
• Various gallium-based Indalloy® alloys, mp between 7.6 and 29.78 °C (corporate page)
• A general search for "fusible alloys" brings up several sources with many choices:

Reference

1. French, S. J. Melting Points of Eutectics. Ind. Eng. Chem. 1936, 28 (1), 111–113. DOI: 10.1021/ie50313a026.

Some bismuth alloys have rather low melting points.

Wood's metal (50% bismuth, 25% lead, 12.5% cadmium and 12.5% tin) melts around 70 °C.

Field's metal (51% indium, 32.5% bismuth and 16.5% tin) melts around 62 °C.

An alloy of 44.7% bismuth, 22.6% lead, 19.1% indium, 8.3% tin and 5.3% cadmium melts around 47 °C.

There is a game, which is a tradition in Germany around New Year, to predict good fortune for the upcoming year: Molybdomancy (german - Bleigießen) While this is unscientific jibber jabber, there is actually some real physics involved.

Tin has a (very) low melting point ($\approx \pu{230 ^\circ C}$) which can easily be achieved with a candle. If you pour the molten tin into water, it will immediately become solid again. (This also works with lead $\approx \pu{330 ^\circ C}$, but that is very toxic.)