Interesting Stuff

My frisbee claims it is 175 grams, but it certainly doesn’t feel like the regulation weight. Consequently, I wanted to weigh it. The problem? I don’t have a scale. However, I have a bathtub, a whiteboard marker, a large bowl, and a bottle that claims to hold 237 ml. I fill the bathtub partway, and put the bowl in it. I fill up the bottle and pour it into the bowl, and then mark on the bowl where the level of the bathtub water is. I empty the bowl, put the frisbee in it, and mark the height of the water on the bowl again. I take the frisbee out of the bowl, and mark the height of the bathtub water on the bowl when it’s empty. I then take the bowl out of the water and measure the distances between the 3 marks. The distance from the bottom mark to the top mark should denote a volume of 237 ml. The distance from the bottom mark to the middle mark should indicate the volume of water whose weight equals that of the frisbee. After a little algebra, I decided that my frisbee weighs roughly 200 +/- 50 grams. I guess it may very well be labelled correctly.