In this lab students will investigate this property of water by counting the number of drops of plain water and soapy water will fit on different sized coins.
This lab will illustrate not only the surface tension of water, but is a great lab for discussing differences in independent and dependent variables as well as the steps in the scientific method. Using the PowerPoint activity that goes along with this lesson, students are guided through each step of the scientific method from asking a question all the way through formulating a well thought out written conclusion. Doing this activity makes it easy to incorporate a writing activity into your science lesson.
I have also included a grading rubric to make grading this lab simple and as quick as possible. Each section is worth a certain number of points, with more important sections worth more points.
There is also a printable worksheet if you would prefer to do this lab without the PowerPoint.
The supplies in this lab are easy to gather and easy to store in a plastic shoebox type container for use from year to year. I usually make a kit out of my lab materials and store it from year to year. I replace consumables at the end of the lab so that when I pull out my box the next year everything is ready to go.