Fluids and the World Around Us
Fluids-which include both liquids and gases-playa central role in our daily lives. We. breathe and drink them, and a rather vital fluid circulates in the human cardiovascular system. There are the fluid ocean and the fluid atmosphere. In a car, there are fluids in the tires, the gas tank, the radiator, the combustion chambers of the engine, the exhaust manifold, the battery, the air-conditioning system, the windshield wiper reservoir, the lubrication system, and the hydraulic system. (Hydraulic means operated via a liquid.) The next time you see a large piece of earthmoving machinery, count the hydraulic cylinders that permit the machine to do its work. Large jet planes have scores of them.
We use the kinetic energy of a moving fluid in windmills, and the potential energy of another fluid in hydroelectric power plants. Given time, fluids carve the landscape. We often travel great distances just to watch fluids move. Perhaps it is tjme to see what physics can tell us about fluids