Jan 21st ~ Measuring at the Meniscus!
The New Year is here and Problem Based Learning projects (PBL's) are once again shaping up for schools in our community. This time around, we are back with Oak Grove Elementary School to work with 4th graders. I won't give away their PBL question, but they are learning how a rain gauge works and will be collecting precipitation rates all semester with the CoCoRaHS Rain Gauge donated to their school. Our (Dr. Barbara Shaw and myself) first visit was to both introduce the PBL question and to teach kids how to measure liquids in graduated cylinders, beakers, and the rain gauge. The first step when measuring water is knowing that water has adhesive properties, meaning it likes to cling to surfaces. This can be seen when you pour water into a glass container and then meet the surface at eye level. What do you see? Probably something similar to the example below. Example of water in a glass measuring container. Where do you measure when it is a curve? Water will curve (...