Heating Curve In this lab, the heat

In this lab, the heating curve generated when ice makes the transition between solid to liquid to gas was investigated. The boiling point and current atmospheric conditions were compared at the locations where different students performed the experiment to determine any effect of atmospheric pressure on the boiling point of water. To carry out the experiment a small pot was almost filled with crushed ice, and enough ice-water was added to cover the ice. The water-ice mixture was stirred for one minute. A thermometer was placed in the ice-water mixture and held so the tip did not touch the pan, and the lowest temperature observed was recorded as temperature at time = 0. The heat was turned on to the highest setting, the mixture stirred while heating and the temperature recorded at one minute intervals. Subjective observations were also recorded, e.g. when all the ice was melted, when bubbles appeared.

Once the water was boiling vigorously, readings were taken every minute until a constant temperature was recorded for five consecutive readings. The highest temperature reached was recorded, and the current local atmospheric pressure was obtained from the National Weather Service link. A graph was created of time/temperature data, and of the boiling point/atmospheric pressure data.

Data from other students for Graph 2:

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Category: Science - H