I just picked up some gallium from these guys that the moderators won't let me link to because that would be advertising for my son. He's really into the elements and science in general. Does anyone have recommendations for interesting experiments using gallium?

 

I'd love to keep his interest going!

Edited February 25, 201510 yr by Phi for All
commercial link removed per rule 2.7

When molten, it dissolves other metals. Aluminium wrapfoil maybe?

 

It's also claimed to make steel brittle even if added in small amount at the surface and be consequently used for sabotage; I've no opinion about that.

 

Some gallium eutectics are liquid at room temperature, Galinstan (Ga-In-Sn) is famous but Ga-In suffices already.

 

Does liquid gallium take less room than solid one?

Mould it into the shape of a teaspoon! Let someone stir their tea and watch them freak out.

When molten, gallium permits the classical electromagnetism experiments without the risks brought by mercury.