This post idea, to test our sunscreen by painting on our paper with sunscreen and leaving them out in the sun, was inspired by the comment by Lady in a Small Town in my earlier post, Sun-bleached Alphabet Puzzle. She said that she’d heard of an experiment where they painted with sunscreen and watched the sun bleach the paper except for the painted portions. It sounded like fun! We added the Scientific method as I have always wondered which type of sunscreen was more effective: rub-on or spray-on.
What is the scientific method? It is a way of finding a problem and searching for the solution, as provided by evidence. The Scientific Method requires four basic steps:
- Ask a question
- Make a hypothesis or a statement of truth
- Test hypothesis with experiments.
- Determine if your hypothesis was indeed true.
Question: Which sunscreen is more effective: Rub-on or Spray-on
Hypothesis: Rub-on is more effective.
We used the same brand of sunscreen for both experiments and with the same SPF. As there were variations in shades between the various pages of construction paper, we folded each page in half. On one half the kids free-style painted with sunscreen. We created a smiley face stencil and on the other half of paper we sprayed sunscreen over the page. Then all the papers were left out in the sun for a few hours.
Solution: As you can see, they are both equally effective.