The polymer in diapers absorbs water and turns into gel in much the same way. The upper part even has a groove in which the seed is found. This structure makes the lower part move a larger distance than the upper part, closing the cone when wet. Then let the open vessels air dry for a few days, until all the water is evaporated and the cones open up. When you show these bottles to your friends, they will have no clue how you got the cones in them in the first place! After the cones are open, you should close the bottles so as to prevent moist air from getting in and making the cones close again.
Article translated from Hebrew by Aviv J. This nifty experiment can be adapted for any age group, with my toddler I kept it simple and used terms he would understand. With older kids you could ask them to write down their predictions of what they think will happen in each situation. You could also go more in depth of how expansion and contraction work. Whatever you do, make it fun!
Kids learn best when they are enjoying themselves! This post was selected from among all recent posts as the winner of lottery 32, which had no valid entrants. You can win again by entering in avijeetdebnath 's regular lottery! Use your measuring tape to measure the length of pinecone B. Write down the length in the column Cold Water Length. Use your measuring tape to again measure the circumference of pinecone B at the widest point.
Write down its circumference in the column Cold Water Circumference. Compare the length and circumference of pinecone B in each column. Did its length or circumference change after you put it in cold water? If so, what kind of changes did you notice? Did it get larger or smaller? Do you notice any other changes about the pinecone?
Does it look different? In what way? After pinecone A has been in the oven for 45 minutes, with the help of an adult, remove it from the oven. Allow it to cool until you can handle it comfortably. Use your measuring tape to measure the length of pinecones A, B and C. Write down their lengths in the column Final Length. Use your measuring tape to measure the circumference of pinecones A, B and C at their widest points. For each pinecone, write down their circumferences in the column Final Circumference.
Compare the length and circumference of the pinecones for each column. Notice which pinecone had the smallest change. Why do you think some pinecones changed more or less than others? Do you notice any other changes in the pinecones?
Do they look different? Extra: After pinecone A is out of the oven, try putting it into the cold water. Remove it after several minutes and measure its length and circumference again.
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