As one tenth of the ice sits above the water, it is then possible to work out the overall volume and thickness of ice in that location.

BBC: Arctic ice thickness 'plummets'

Compared to the very first PS3 model with 60GB HDD, the internal volume as well as its thickness and weight are trimmed down to approximately two-thirds.

ENGADGET: Sony unveils slimmer PS3: $300, lands in September (updated!)