Richard Hammond is showing us why we should never mix alkali metals with water, e.g. Rubidium. Rubidium is the second most electropositive of the stable alkaline elements and liquefies at high ambient temperature (102.7 F = 39.3 C). Like other group 1 elements this metal reacts violently in water which can cause fires. In the video, you will see they do the experiment. Watch the video…

[via Techeblog]