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| So Cool! |
You started off with a fun exploration of
an interesting system of milk, food coloring, and dish soap. I
encourage you to try this at home to impress and amuse your family. You
conducted your first controlled experiment today when you changed one
component of the system and then observed the effect of that change.
Now I want you to think about what caused the system to change.Take a look at this short video that gives one possible explanation of the phenomenon of the milk and food coloring.
Click Here to Watch the Milk Experiment Video
Now I want you to think about your experiment. Do your results support or contradict the explanation you just saw? Post a comment about how your results support or disclaim the milk experiment explanation.
P.S. Sorry guys, I didn't take any pictures of you this time.
When I was partnered with Chris Jackson we showed that our results from the milk experiment supported the theory proposed in the video. Our materials were the same and our way of conducting the experiment was similar. The explanation stated in the video is true based on our results from the experiment.
ReplyDelete-jack
Jack, I'm dying to know more details from what you did. Your explanation here is very general and is begging for some supporting information.
ReplyDeleteOur experiment seemed to progress very similarly way as the one in the video. However I don't know whether the two experiments are exactly the same because several variables in theirs were different than ours such as the fact that they put multiple drops of each color of food coloring and those were all bunched together where ours were in four separate corners, they also put several drops of soap into the mix where we put one singular drop in the middle of the bowl. With all of this said our results do seem to correspond to theirs in a generality, and this is because our food coloring too was sucked in and then seemed to be pushed outwards as the soap dissolved and the in the video since all their coloring was placed together it just was pushed out. So to sum it up I think that even though there were some differences I think that the main idea that the soap pushed the coloring along as it dissolved is correct.
ReplyDelete-Sarah
Our experiment supported the explanation in the video. For the first round, we did experiment with normal milk and it had the same result like in the video. As we put a drop of soap into the milk with food colors in it, the colors started spreading out on the surface, moving, dividing into separated sections of colors, and gradually mixing with each other. However, for the second round, we changed to half half milk; the result was a little bit different. After we put a drop of soap into the milk, the colors spread out but more slowly than those in the first experiment. As we used a different kind of milk, it might have a particular affect on the movement of the food colors. The explanation for the movement of the colors in the video is that food color is less dense than the milk, so when soap is put into the milk, it breaks up the fat and causes the colors to expand. Thus, I found out that the fat in the half half milk was the reason why the colors expanded more slowly. Since the fat in half half milk is denser than that in the normal milk, it is harder for the same amount of soap we used in the first experiment to break up the fat. As a result, the colors spread out more slowly. After that, we put one more drop of soap into the milk; the colors started moving faster. To sum up, changing any quantity of any element in the experiment like fat in milk will affect the movement of the food colors.
ReplyDelete-Quynh Anh
Like Sarah, Zeynep and I had similar results to those in the video. The way we conducted our experiment was a little different though. We placed our food coloring drops at the same time in a square shape, while in the video, the person places the food coloring drops one at a time and they are all almost on top of each other. During the experiment I didn't understand why the dish soap had the reaction it did when dropped in, but now it seems pretty obvious. It's basically like how I use soap to get the grease (fat) off of dishes when I'm washing them. The video basically says the soap dissolves the fat, allowing the colors to be free to move around. The results of the experiment are basically that when you drop soap into a mixture of food coloring sitting on top of milk, the soap while remove the fat from the milk, allowing the coloring to mix with each other.
ReplyDeleteWhen we added soap to the mixture, the four colors started spreading quickly in the milk. The expansion was centered at the point where the soap was dropped. During the experiment Vincent and I thought that the soap caused the milk to go through a chemical reaction which allowed the color dye to spread better. According to the video, the fat in the milk got broken down by the soap and it allowed the color dye to expand more freely and rapidly. Therefore, I believe that our hypothesis was very close to the explanation except than the fact that we didn't think more deeply about what was actually going through chemical reaction in the milk. However, when we used vinegar, it must not have broken down the fat as much as the soap did and that's probably the reason the dyes didn't expand as much using vinegar. - Danny
ReplyDeleteAs shown in the video, our results supported the explanation. Doing a milk experiment, I and my partner, Daniel Chung used 2% milk and food-coloring dyes as dependent variables.Beside we had two independent variables, which were soap and vinegar. In our first experiment, we dropped a drop of soap into the mixture made of milk and four-food coloring dyes, one at each compass point 90 degrees apart. The color dyes expanded as soon as the soap drop was put in, as demonstrated in the video. In the second experiment, we used the same mixture, yet we dropped a drop of vinegar. At this time, the dyes expanded slower that those of the first experiment. Accordingly, we could find out that the drops of soap and vinegar lowered the density of the milk, which allowed the color dyes to spread by dissolving fats in the milk.
ReplyDelete