Bobbing Raisins at Home STEM Experiment скачать в хорошем качестве

Bobbing Raisins at Home STEM Experiment

Use the magic of science to make a raisin bob up and down without touching it. Want to feel more like a scientist? Check out our lab reports and more experiments for students by going to: http://ms.spr.ly/6059w9AyX In this experiment, students will learn: • About buoyancy • What density is • How the density of an object can be changed by increasing or decreasing its buoyancy Supplies: • Clear glass jar • Carbonated drink (clear) • Handful (4-6) of raisins Instructions: 1. Pour the carbonated drink into the glass jar. 2. Drop the raisins into the glass jar. What Happened? The raisins begin to dance and bob up and down. The bobbing up and down happens because the bubbles of the carbon dioxide gas in the drink are much less dense than the drink and the raisins. Raisins are denser than the carbonated drink, so they will sink when you first drop them in. When the raisins are covered with the bubbles, they become less dense than the drink, so they start to rise. The bubbles act as a flotation device for the raisins. As the bubbles rise, they start to burst and the raisins become denser than the drink again and sink.