How much does water expand when it's frozen?

Asked by: Remi


Short Answer: by about 9% to 10%

Long Answer:

Normally, things expand when heated and contract when cooled. Water is an exception to this rule. Even though water does expand when heated and contract when cooled at most temperatures, water expands when cooled and contracts when heated between 4 degrees Celsius and 0 degrees Celsius.

A very good web site about the properties and oddities of water can be found on the Okanagan University, Dept. of Geology website at:

Answered by: Charles Hill, Network Engineer, Deltona, FL



Science Quote

'I beseech you to take interest in these sacred domains so expressively called laboratories. Ask that there be more and that they be adorned for these are the temples of the future, wealth and well-being. It is here that humanity will grow, strengthen and improve. Here, humanity will learn to read progress and individual harmony in the works of nature, while humanity's own works are all too often those of barbarism, fanaticism and destruction.'

Louis Pasteur