exam 2 In-class notes

exam 2 In-class notes - Chapter 5 2/19/2008 9:55:00 AM...

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Chapter 5 19/02/2008 09:55:00
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Chapter 5 19/02/2008 09:55:00
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Pressure 19/02/2008 09:55:00 Galileo Couldn’t figure out that the atmosphere had pressure to it. Was a confused child when it came to pressure Torricelli Came up with the first Barometer… how to measure atmospheric pressure Water could be used in a barometer but is too light Mercury is 13,6 times heavier than water They also used aneroids Standard sea level pressures 29.29 in of Hg (Hg is mercury) o most common used o associated with aviation 1013.25 mb o most commonly used o associated with weather terms 14.7 lb/square inch Aneroid barometer Aneroid barograph o Looks like an accordion We also looked at a typical aneroid barometer The inner ear
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Eardrum connects to inner ear, outer ear, etc… The eardrum closes off the inner ear from the outer ear o You can feel pressure changes in your inner ear o Tubes help you equalize pressure in your ear Problems with Pressure The hard boiled eggs o In high areas with different pressure, it takes different amount of time to boil water o At sea level, water boils at 212 degrees F/ 100 C at sea level o In Denver, water bois at 203 F o At Mt. Everest, water boils at 160 F Wounds heal slower at high altitudes Pulmonary Edema o Lungs fills with fluids o Climbing at high altitudes Altitude sickness o Hahahaaaa… o Want to drink water all the time Pressure is an absolute positive must It will decrease as you go up vertically through the atmosphere!! As you go horizontally through the atmosphere, anything will happen Once we get above 18,000 ft. pressure doesn’t decrease in a linear fashion… but it still decreases!!
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Pressure Gradient = p1-p2 d o The change in pressure over distance The greater the pressure gradient, the greater the winds will be The vertical pressure gradient is greater than the horizontal pressure gradient. This is because of gravity. Significance of pressure gradient: we can look at weather charts and give a ballpark figure about how strong the winds will be When the isobars are close together, the wind is stronger Equation of state Pressure=(density)*(gas constant)*(temperature) Pressure The direction of molecules hitting something Pressure is the force over an area applied on an object in a direction perpendicular to the surface Changing the direction of molecules will change the pressure Hydrostatic Equation If we go from point A to point B, pressure has to decrease Change in density= - (pressure) * (gravity) * (change in height) Airplanes fly because of pressure He showed us an example with the piece of paper, blowing on it
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The portion of the earth that we live is the troposphere Tropopause The tropopause is closest to the poles because it is the coldest. On the other hand, the warmest areas are farthest away from the tropopause
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This note was uploaded on 05/03/2008 for the course AER 118 taught by Professor Schroder during the Spring '08 term at Miami University.

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exam 2 In-class notes - Chapter 5 2/19/2008 9:55:00 AM...

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