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Cooling Curve of Stearic Acid Conclusion
Stearic Acid Cooling Curve Conclusion Related classical Chinese Creation
Experimental Observation
Put stearic acid in the chamber, melt it with fire, wait for its liquid, then observe its cooling change, and draw the cooling curve. In the meantime, observe its shape, record the number by hand, think about it, and predict the law of physical state transition.
Signs of the Curve
At the beginning, stearic acid is a liquid, and the temperature decreases rapidly. The curve drops sharply. This is because it is transferred to the surrounding area with heat, and the heat flow is fast, causing a sudden drop in temperature. When the temperature approaches the point of solidification, the temperature decreases slowly, and the curve flattens. When stearic acid solidifies, it releases the coagulation heat to make up for the loss of heat dissipation, so the temperature drop slows down. Eventually, stearic acid solidifies completely, and the temperature decreases rapidly, and the curve becomes steep again.
Conclusion
Looking at this cooling curve, it can be seen that the state change of matter is closely related to the transfer of heat. When a liquid solidifies, there is a release of heat, and this coagulation heat can also slow down the temperature drop. And from the shape of the curve, the temperature of stearic acid solidification can be pushed, which is the key temperature of the state change of matter. Although this experiment is simple, it reveals the mystery of physics, and it is very useful for the study of the thermal change of matter, which can be used as a lesson for other substances.
Experimental Observation
Put stearic acid in the chamber, melt it with fire, wait for its liquid, then observe its cooling change, and draw the cooling curve. In the meantime, observe its shape, record the number by hand, think about it, and predict the law of physical state transition.
Signs of the Curve
At the beginning, stearic acid is a liquid, and the temperature decreases rapidly. The curve drops sharply. This is because it is transferred to the surrounding area with heat, and the heat flow is fast, causing a sudden drop in temperature. When the temperature approaches the point of solidification, the temperature decreases slowly, and the curve flattens. When stearic acid solidifies, it releases the coagulation heat to make up for the loss of heat dissipation, so the temperature drop slows down. Eventually, stearic acid solidifies completely, and the temperature decreases rapidly, and the curve becomes steep again.
Conclusion
Looking at this cooling curve, it can be seen that the state change of matter is closely related to the transfer of heat. When a liquid solidifies, there is a release of heat, and this coagulation heat can also slow down the temperature drop. And from the shape of the curve, the temperature of stearic acid solidification can be pushed, which is the key temperature of the state change of matter. Although this experiment is simple, it reveals the mystery of physics, and it is very useful for the study of the thermal change of matter, which can be used as a lesson for other substances.
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