新西兰惠灵顿大学化学Essay代写:跳舞葡萄干科学实验

当您和您的孩子观察葡萄干时,您应该注意到它们最初沉入玻璃杯的底部。这是由于它们的密度大于液体的密度。但由于葡萄干表面粗糙,凹陷,所以它们充满了气袋。这些气穴吸引液体中的二氧化碳气体,产生你应该在葡萄干表面观察到的小气泡。二氧化碳气泡增加每个葡萄干的体积而不增加其质量。当体积增加而质量不增加时,葡萄干的密度降低。葡萄干现在比周围的液体少,所以它们上升到表面。在表面,二氧化碳气泡弹出,葡萄干的密度再次变化。这就是他们再次下沉的原因。整个过程重复进行,看起来好像葡萄干在跳舞。尝试将葡萄干放入带有可更换盖子的罐子里或直接放入一瓶苏打水中。当您重新盖上盖子或盖子时,葡萄干会发生什么?将它取下后会发生什么? 新西兰惠灵顿大学化学Essay代写:跳舞葡萄干科学实验 As you and your child observed the raisins, you should have noticed that they initially sank to the bottom of the glass. That’s due to their density, which is greater than that of liquid. But because raisins have a rough, dented surface, they are filled with air pockets. These air pockets attract the carbon dioxide gas in the liquid, creating the little bubbles you should have observed on the surface of the raisins. The carbon dioxide bubbles increase the volume of each raisin without raising its mass. When the volume increases and the mass does not, the density of the raisins is lowered. The raisins are now less than the surrounding fluid, so they rise to the surface. At the surface, the carbon dioxide bubbles pop and the raisins’ density changes again. That’s why they sink again. The whole process is repeated, making it look as though the raisins are dancing. Try putting the raisins in a jar that has...
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