This week during science the kids got A LOT of practice using a graduated cylinder. Each team had to follow very specific directions for adding and subtracting precise amounts of red, blue, and yellow water to produce a beautiful rainbow of colors. Afterwords we discussed possible sources of error including: spilling, not following directions, measuring incorrectly, and in this case, the starter blue water being too dilute, accounting for the strange greenish color all the groups got instead of purple.
Just for fun, estimate the volume of...
* a mouthful of water
* cup of apple juice
* a kiddush cup
* water used in your average bath
Then check yourself with a measuring cup. (This experiment was conceived during dinner one night when one of my kids INSISTED that the other one got more juice...)