4. Standpipes and air cushions.
Exercises
1. Where have you seen an air cushion? Describe it and its use.
2. Where have you seen an hydraulic press? Why and how used?
3. Where have you seen hydraulic elevators? What moves them?
4. Where do you know of liquids under pressure? Three examples.
5. What is the pressure in water at a depth of 1500 cm. Express in grams per square centimeter and in kilograms per square centimeter.
6. What head[C] of water is required to give a pressure of 200 g. per square centimeter? 2 kg. per square centimeter?
7. What pressure will be produced by a "head" of water of 20 meters?