A short video demonstration of convective cooling being the result of gravity....Down here on Earth, boiling water forms lightweight vapor bubbles that are pushed up to the water’s surface and release their heat. In free-fall, however, buoyancy differences don’t exist, so the vapor can only shape itself into an undulating ‘balloon.’...More information:Research to Watch on the STS-133 Shuttle Launch to the International Space Station....AS
Posted by Joe Olson (forum) on Apr 13th 2012, 8:00 AM EDT
At sea level of 14.7 psi, water boils at 212 F or 100 C. In the "Mile High City" of Denver, with ~11 psi atmospheric pressure, ater boils at 180 F, extending times for 'open boil' of foods or requireing a pressure cooker. One experiment your are cautioned to NEVER repeat is to place 180 F boiling hot coffee (or tea, soup, etc) into a thermos bottle and take off in an airplane. In the older glass liner thermos bottles the resulting re-boiling will explode the liner. In the newer, all stainless steel vacuum bottles, the only slightly cooled 180 F fluid will reboil with decreased pressure and opening the cap will cause a violent steam flash. Boundary points for all fluids and gases vary with all parameters which is why engineers consult a three dimentional P-V-T (for Pressure-Volume-Temperture) charts to predetermine the behavior of substances given two parameters. One interesting feature of a P-V-T chart is the "Triple Point" were gas-liquid-solid conditions join. Eduction is NOT a bucket that you fill, education is a fire that you LIGHT. May your fire for knowledge burn bright. Find and Share Truth.
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