I havent ever had a drink that overfilled itself when the ice melted. Is liquid nitrogen still a gas?
Sorry that was the short bus answer.
There is a name for that property of water, but I don't remember it. Water is most dense at 4 degrees centigrade, the expansion actually begins before the transformation to a solid.
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Yup, fill a glass of water up half way and mark it. Put it in the freezer and you can watch it rise above the line while freezing. Pretty crazy stuff!
I tried that, But I had a very hard time seeing through the freezer door
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Ok smart guy. ;-) You have to mark it first then check on it a few times. It's not gonna thaw out instantly when you open the door to check on it.
Metarinka,
that's why ice floats on water.
Giovanni S. Crisi
this is very true proffessor and it's what protects our liquid oceans from totally freezing over. Unlike the froozen methan oceans found on moons of other planets.
from a chemistry standpoint water has many properties that deviate from what is expected. Similar to how it expands upon freezing, is a dense liquid, yet very light gas etc etc
http://www.lsbu.ac.uk/water/anmlies.html
Uhh,if I'm understanding this correctly and can compare it to the part of my body that also expands in volume when going to a solid state,know what I'm asking?
I have seen pipe spilt on two seperate jobs. Hydro in the winter below freezing temps. without heat trace first is stupid. the cold metal will freeze atleast a thin layer of ice making the test inaccurate. Olny good part is the ot it takes to replace the pipe.
Hi all,
Up here in the great white north, (Alberta, Canada) hydrotesting is done every day in the freezing temps. Just did one today -40 degrees celsius. Methanol - water mix, used all the time for hydro in the winter.
Back in my days of erector engineer I was in charge of the construction of a natural gas compressing station in the south of Argentina.
When all of the piping systems were erected and ready for hydro testing, with the client's approval we decided to run two separate tests, one after the other: one for the low pressure piping (working pressure 600 psig) and another one for the high pressure piping (working pressure 900 psig).
It took a whole cold winter day to fill and vent completely the piping and have them ready for testing. It was 6 pm, we were tired and decided to run the tests the next day. However, the piping was mostly outdoor and the night temperature was expected to go down to minus 10 Celsius (you translate into Farenheit).
I had foreseen that, so previously I had bought plenty pieces of lumber, those used on home fireplaces. We put groups of 4-5 lumber pieces under the pipes (gas compressing stations' piping use to be at a low height), at a distance of about 10 feet from each other, and lighted them up. The night watchman was given the task of taking care that the fires didn't quench, feeding them with extra lumber pieces if necessary. As expected, the night temperature went down to minus 9 Celsius, but, needless to say, the water into the piping didn't freeze.
Next day we ran the two hydro tests, first the low pressure one and then the high pressure. Not even one leak was detected.
Giovanni S. Crisi
Sao Paulo - Brazil