science module 2

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science module 2
2014-09-04 17:32:12
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  1. Humidity
    the moisture content of air
  2. Absolute humidity
    the mass of water vapor contained in a certian volume of air
  3. Relative humidity
    the ratio of the mass of water vapor in the air at a given temperature to the maximum mass of water vapor the air could hold at that temperature expressed as a perdentage
  4. Greenhouse effect
    the process by which certian gases trap heat that radiates from the earth
  5. Parts per million
    the number of molecules or atoms of a substance in a mixture for every 1 million molecules or atoms in that mixture
  6. The temperature is the same at 1:00 on two consecutive days. For a person  working outside the second day feels cooler than the first day. on which day was the relative humidity higher?
    the first day had more humidity.
  7. A child decides to keep his goldfish outside in a small bowl. He has to add water every day to keep the bowl full. On two consecutive days the temperatures are very similar but on the first day the relative humititiy is 90% while on the second day it is 60%. on which day will the child add more water to the goldfish bowl?
    the second day
  8. if you put a glass of water outside when the relative humidity is 100% how quickly will the water evaporate
    it will not evaporate
  9. why does sweating cool people down
    the sweat evaporates and as it evapoates  removes the heat from the skin cooling down
  10. what is the percentage of nitrogen in dry air? what about oxygen?
    nitrogen: 78%      oxygen: 21%
  11. what would be the consequence of removing all the ozone in the earth's air supply
    without it the ultralight would kill all living things
  12. what would be the consequence of a sudden increase in concentration of oxygen in the earth's supply
    more fires and breathing problems for all living organisms
  13. suppose astronomers found another solar system in which ther was a sun just like our sun. suppose further that a planet in this new solar system was just as far from the sun as is the earth from our sun. since the vast majortiy of energy that planets get comes from their suns is it reasonable to assume that the new planet would have roughly the same average temperature as that of earth? why or why not
    the new planet does not have oxygen or any of the other gases that earth has so it will not have the same temperature
  14. what makes up the majority of the air we exhale
  15. do we exhale more carbon dioxide or more oxygen
  16. do the data indicate any significant global warming
  17. the current concentration of ground level ozone in the air is about 0.110 ppm. what is that percent
    o.110/1 x 1%/10,000 = 0.0000110%
  18. suppose you had a sample of air in which the concentration of nitrogen oxieds is 0.023%. what would the concentration of nitrogen oxieds be if you expressed it in ppm
    0.023%/1 x 10,000/1% = 230ppm
  19. is the air cleaner today or was it cleaner 30 yers ago
    its cleaner today
  20. what is a cost/benefit analysis
    a kind of reasoning that asks " is the benefit worth the cost?"
  21. what does a catalytic converter do in a car
    reduces the carbon monoxide produced by the car by turning the carbon monoxide into carbon dioxide
  22. what does a scrubber do in a smokestack
    reduce the amount of sulfur oxide emitted by smokes stake
  23. in the united states many regultions are aimed at decreasing the amount of ground level ozone is considered a pollutant. at the same time many regulations are aimed at increasing the amount of ozone in the ozone layer . despite the fact ozone in the ozone layer is the same a s ground level ozone ozone in the ozone layer its considerd essential substance and not pollutant why
    the ozone in the ozone layer protects us from the ultralight that comes from the sun. the ozone layer is too high in the atmoshere to be considered a pollutant