Recent content by natasa_o

Hi, I would like to re-define my question from June 5 th. I made an experiment. A bigger surface of rock wool insulation matrix (size 0.4 m x 0.4 m x 0.1 m) was moistened with 45 g of water and sealed with PVC. Then the sealed sample was put into the testing set up. The testing set up...

The sample of rockwool was seald with PVC foil. Probably the water was transferred to PVC and freezing did not take place in the rockwool, but in on the PVC foil. Is it possible there might be no nucleation centers on the PVC and subcooling was a consequence of that? I think there were milions...

M Quack, your explanation seems to be OK. I did not mention before that ice melts at 0 C. Does it change anything? Can freezing temperature also be anyhow connected with surface forces?

I ve forgotten to mention, that after water starts freezing at -4C, the temperature of the surface near which freezing takes place rises for about 1 C. When the ice has formed, it drops again.

Thank you for your answer, but longer explanation would be very appreciated. Used porous material is rockwool thermal insulation. Thanks for your help in advance.

Hello, I made an experiment. On the bigger surface of the sample of porous material (size 0,5 m x 0,5 m x 0,1 m) thin layer of water was sprayed (25 g). After that the sample was sealed and the moistened surface was cooled to the temperature about 268 K (-5 C). I think most of water stayed at...