Barometers are used to measure pressure. The figure above illustrates a homemade barometer, specifically how it functions at relatively high and low pressures. To construct a homemade barometer, a flexible medium (such as a balloon) is stretched over a container of some sort. It is secured around the container, and then a section of a straw is taped atop the medium, so that it points out horizontally. Additional details on barometer construction may be found at the video link below:
https://www.youtube.com/watch?v=UcCnTJq1Kss&feature=related
Though inexpensive when compared to more "scientific" barometers, homemade barometers have a disadvantage: durability. The following picture was taken after two weeks of a barometer's use. This malfunction could have likely been rectified through a smaller glass container; the balloon would not have been under nearly as much stress/ strain.
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