Boiling Water to Make Ice On YouTube.

After some conversation on the subject on a popular HVAC website, this was yet another experiment I just had to do! What I have done here is add some tap water to a baby food glass jar. I rigged a schrader valve to the lid. The first part of the test I attached two recovery tanks that were already in a deep vacuum. These tanks are the size of your typical Propane Tank for a BBQ grill. A hose is connected from them to the small glass jar. I do this to obtain a quick change from atmospheric pressure in the glass jar to a deep vacuum in a matter of a second. As observed, the water begins to boil instantly but not a big change in temperature. The seal may not have been 100% and it did not maintain 30" of vacuum. (That could be partially due to the water changing into vapor as well without continued pumping). So I then attached a 7CFM vacuum pump directly to the small glass jar. It took a while but the temperature of the water in the jar began to drop from the ambient 78 degrees F in the room to below freezing. At 27 degrees the water still did not change to a solid (ice). That would not happen at atmospheric pressure unless salt or soemthing else was added. Once the water fell to approx 22 degrees it started to change to a solid. After some more pumping I had no liquid water and about 1/4" of ice in the bottom of the glass jar. My basic laymens explaination: Water nomally boils at 212 degrees F at sea level atmospheric pressure. Raise the pressure and it boils at a higher ...

Tags: HVAC, triple, point, water, H20

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