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<br />. <br /> <br />experiment where ice at minus-10 degrees Fahrenheit was put <br /> <br />in an insulated chamber along with a temperature probe <br /> <br />connected through an analog-to-digital interface to a <br /> <br />computer. For eighteen hours the computer tracked the <br /> <br />temperature change as the water went through the three <br /> <br />states of solid, liquid, and gas and then decayed to room <br /> <br /> <br />temperature. The result of this experiment was a computer <br /> <br /> <br />generated graph showing the temperatures of the three states <br /> <br />for the atmospheric pressure at Monument, Colorado and this <br /> <br />graph, without labels and titles, was the test presented to <br /> <br />the students for completion. <br /> <br />It also showed the leveling of <br /> <br />. <br /> <br />temperatures during a change of state and the effect of <br /> <br />altitude on the temperature of boiling water. <br /> <br />3. The change of state of water was also demonstrated <br /> <br />using a distillation column. Water was boiled and the gas <br /> <br />captured in a distillation column where it was cooled and <br /> <br />returned to a liquid state. This demonstration was extended <br /> <br />to show that the distillation of water could be used as a <br /> <br />method of water purification as well as the crucial part it <br /> <br />played in the water cycle. <br /> <br />. <br /> <br />13 <br />