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Vērtējums:
Publicēts: 17.11.2003.
Valoda: Angļu
Līmenis: Vidusskolas
Literatūras saraksts: Nav
Atsauces: Nav
  • Konspekts 'Environmental Effects', 1.
  • Konspekts 'Environmental Effects', 2.
  • Konspekts 'Environmental Effects', 3.
  • Konspekts 'Environmental Effects', 4.
  • Konspekts 'Environmental Effects', 5.
  • Konspekts 'Environmental Effects', 6.
  • Konspekts 'Environmental Effects', 7.
  • Konspekts 'Environmental Effects', 8.
  • Konspekts 'Environmental Effects', 9.
  • Konspekts 'Environmental Effects', 10.
Darba fragmentsAizvērt

1.CFCs and substitutes and the ozone hole.
The environmental effects of CFCs and their substitutes
a.CFCs - highly stable molecules, lifetime in the atmosphere of between 50 and 100 years; contain 2 or 3 chlorine atoms.
b.CFCs substitutes ( transitional compounds)
i.HCFCs - one or more of the chlorine atoms has been replaced by hydrogen atoms, lifetime in the atmosphere about 20 years, have a tenth or twentieth of the potential damage of the CFCs.
ii.HFCs - all the chlorine is replaced by hydrogen - not damaging to ozone - lifetime in the atmosphere about 20 years.
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