Substances where the solid is less dense than the liquid?

Someone asked me a straightforward question today -
are there any other substances besides water where the solid is less dense than the liquid?

I realised I couldn't think of any -
anyone know any examples?

I'm guessing something else that has loads of hydrogen bonding...


Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

like water, gallium expands

like water, gallium expands on freezing and would therefore be less dense than the liquid form.

I knew that answer last

I knew that answer last year, when I needed it for General Inorganic.

I also knew the conditions for infrared spectroscopy (change of dipole moment) and the Franck-Condon Principle last year. But, when I was asked about them in my viva on Monday, I clean forgot it all :(

And the guy who lectured us on the Franck-Condon Principle was one of the guys doing my viva.

Oh dear.

WebElements: the periodic table on the WWW []

Copyright 1993-20010 Mark Winter [The University of Sheffield and WebElements Ltd, UK]. All rights reserved.