As another has posted you have mixed up a few things: Your example of the ocean and the pressure increasing as we go to deeper water is correct. In a simliar manner we are all in an ocean of air and the air pressure increases as we go deeper in that ocean of air. However, air is a little different than water in that it's density increases significantly as the pressure is increased. At sea level we are in the deepest part of the air ocean and the pressure and density of air is at its maximum. Conversely at the top of Pikes Peak we are in "shallow air" and the pressure and therefore density is much less than at sea level. This air pressure is applied equally at the inlet side and the exhaust side of an engine so the change in power output results from the change in air density. An exception would be for forced induction engines; the inlet air is pressurized which increases the density and in the event delta pressure is increased across the inlet system the air velocity can also increase. In this case the change in power results from the air density increase and to a smaller degree the velocity increase.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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