On 15 Feb 2016 at 12:15, Richard Aiken wrote:

> Except that - as several somebodies who know the actual math involved
> have pointed out repeatedly - simple water would work better as a heat
> sink, since it's denser (which is what you want in a heat sink) and
> MUCH less difficult to process/transport/manipulate than is liquid
> hydrogen.  

Water has an amazing specific heat capacity as well, and will 'sink' even more energy
changing states from liquid to gas (i.e. boiling).