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Unit 4 Science
Ms. Green
| Question | Answer |
|---|---|
| Why is the air pressure lower at the top of a mountain than at the bottom? | There is less air above you because your column of air is shorter and also includes less air molecules considering that the highest density of molecules is near to sea level. |
| What is air pressure? | -The amount of force per area |
| Why does the wind blow toward the beach from the ocean in the afternoon but the opposite way at night? | Land absorbs heat quicker and to higher temp than water so in the day the air above land= heated and rise so the air from the ocean must come and fill in where air used to be-> WIND. at night water retains the heat and land loses it so the opposite occurs |
| Why does air exert pressure on the surface of earth? | -gas has mass so the weight of all those air molecules exert pressure on earths surface |
| How is air pressure measured? | -By a barometer, for a toricelli barometer it will then be in inches of mercurcy and for the modern Aneroid barometer it will be measure in millibars |
| What are the four factors that affect air pressure? | -Altitude, temperature, amount of water vapor, and being able to lift/rise on its own. |
| As altitude increases what does air pressure do? why? | -decrease, because there will be a smaller and less dense column of air above you. |
| As temp increases what does air pressure do? why? | -decrease, because as they warm the air molecules will spread out and rise so as to limit pressure. |
| As the amount of water vapor in the air increases what does air pressure do? why? | -decrease, because even though moisture in the air may seem heavy to us on earth, in the atmosphere it is actually one of the lighter materials so it reduces pressure. remember that this is COUNTER-INTUITIVE |
| As air lifts/rises on its own what does air pressure do? why? | -decrease, because when the motion of air molecules is upward than there is less pressure on the surface. |
| How is wind caused? | -As a result of difference in pressure, air molecules flow from areas of high pressure to low. |
| What is the speed of wind dependent on? | -”pressure gradient”, or how high the difference in pressure is |
| What do H’s and L’s on a weather map stand for? | -The high and low pressure |
| What kind of weather would be associated with H? L? | -High pressure would mean sun and moderate conditions and low pressure would be moisture and rain, sometimes even storms. |
| What do the “birdies” on a map represent? and what about their feathers? | -they represent the direction that the wind is blowing and the more “feathers” there are, the higher the speed of the wind |
| From what direction would easterly winds be coming from? | -FROM the east TO the west |
| What are the sources of water vapor? | -condensation and precipitation |
| What percentage of the atmosphere is water vapor? | -0-4 %, but is very important nonetheless |
| What one place does all water eventually go? | -The atmosphere, but the atmo cannot hold that much of it at a time |
| What does the process of changing state require? | -energy to be transferred as a form of heat |
| What is latent heat? and what is it measured in? | -it is a non temperature changing kind of heat, and is measured in joules or calories |
| what is evaporation? | -liquid to gas process |
| what is the latent heat of vaporization? | -when energy absorbed by water molecules during evaporation is from latent heat |
| what is condensation? | -gas to liquid state |
| what must happen for condensation to occur? | water molecules must release their stored heat energy (latent heat) |
| What does this released energy cause? | -violent weather and transfer heat from oceans to the poles |
| what is sublimation? |
Created by:
korinna.garfield
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