Making Predictions

Here is a simple experiment to incorporate making predictions and reading graduated cylinders. I have two 1-Liter graduated cylinders set up, one in a glass cylinder with blue food coloring and one in a plastic graduated cylinder with green food coloring.

I filled both with water a few days before the start of school and an equal amount of drops of food coloring. Students will make predictions on small post-it notes and place it on the drawing of a large graduated cylinder. Where do they think the water level will be at the end of school? Will it evaporate before school ends? By what date?

I will also have them come up with factors that affect the rate of evaporation on larger post-it notes. What affects evaporation? Will the air in our classroom be drier in the Winter when the heat is on? Is our classroom humid now since it is warm out?

I will post their predictions and questions next week. At the start of the month, I will also post the volume so they can see the evaporation rates over time.

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2 thoughts on “Making Predictions

  1. Breanna July 13, 2018 / 1:51 pm

    What were the results of this activity, I am thinking about using it in my classroom!

    Like

    • Liz LaRosa July 19, 2018 / 10:55 am

      Over 900 mL evaporated 🙂 I had to add a few drops of Iodine every so often to keep the water from getting funky.

      Like

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