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Cooling Curve For Stearic Acid
The cooling curve of stearic acid
At night, in a static chamber, stearic acid is placed in a special device, and it is heated with fire to melt it into a liquid. Turn off the fire, observe its cooling change, and draw its cooling curve.
At the beginning, the temperature of the stearic acid liquid is high, and there is a temperature difference between it and the cold air in the chamber, and the heat gradually dissipates around. Its temperature drops slowly, like the water of a river, going down the river, without encountering any obstacles, and it is still a liquid phase.
Russia, the temperature drops to a certain value, and stearic acid begins to condense. At this time, although it is still dissipating heat, the temperature actually stands but does not fall, and this temperature is its freezing point. Looking at it, the liquid gradually condenses into a solid, like ice on the water surface, from thin to dense.
After the total condensation is solid, stearic acid cools down with heat dissipation, and the temperature drop is faster than when it coagulated before, because its specific heat capacity changes. Finally, its temperature is gradually the same as room temperature, and the cooling stops.
This cooling curve, such as the whole process of stearic acid cooling, is of great benefit to the properties and changes of the research substance.
At night, in a static chamber, stearic acid is placed in a special device, and it is heated with fire to melt it into a liquid. Turn off the fire, observe its cooling change, and draw its cooling curve.
At the beginning, the temperature of the stearic acid liquid is high, and there is a temperature difference between it and the cold air in the chamber, and the heat gradually dissipates around. Its temperature drops slowly, like the water of a river, going down the river, without encountering any obstacles, and it is still a liquid phase.
Russia, the temperature drops to a certain value, and stearic acid begins to condense. At this time, although it is still dissipating heat, the temperature actually stands but does not fall, and this temperature is its freezing point. Looking at it, the liquid gradually condenses into a solid, like ice on the water surface, from thin to dense.
After the total condensation is solid, stearic acid cools down with heat dissipation, and the temperature drop is faster than when it coagulated before, because its specific heat capacity changes. Finally, its temperature is gradually the same as room temperature, and the cooling stops.
This cooling curve, such as the whole process of stearic acid cooling, is of great benefit to the properties and changes of the research substance.
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