Читать книгу Common Science - Carleton Washburne - Страница 9
Fig. 5. The water is held in the tube by air pressure.
ОглавлениеExperiment 4. Push a rubber suction cap firmly against the inside of the bell jar of an air pump. Try to pull the suction cap off. If it comes off, press it on again; place the bell jar on the plate of the air pump, and pump the air out of the jar. What must have been holding the suction cap against the inside of the jar? Does air press up and sidewise as well as down? Test this further in the following experiment:
