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ALLA SERA
Forse perchè della fatal quìete
tu sei l'immago, a me si cara vieni
o sera! E quando ti corteggiano liete
le nubi estive e i zeffiri sereni,
e quando dal nevoso aere inquìete
tenebre e lunghe all'universo meni
sempre scendi invocata, e le secrete
vie del mio cor soavemente tieni.
Vagar mi fai co' miei pensier su
l'orme
che vanno al nulla eterno; e intanto
fugge
questo reo tempo, e van con lui le
torme
delle cure onde meco egli si strugge;
e mentre io guardo la tua pace,
dorme
quello spirito guerrier ch'entro mi
rugge.
Il petrolio è una miscela di
idrocarburi di vario peso
molecolare.
Un idrocarburo è un
composto formato da un
numero variabile di atomi di
idrogeno (H) e carbonio (C)
Lo sfruttamento di un
giacimento petrolifero viene
eseguito tramite vari tipi di
strutture che cambiano a
seconda della posizione del
suddetto giacimento:
Se il giacimento è molto
superficiale e su terra emersa
si useranno delle pompe, che
mandano giù acqua ed
estraggono petrolio.
Se il giacimento è di terra
emersa ma più profondo,
l'estrazione sarà più costosa
perché ad una pari quantità di
petrolio estratta sarà maggiore
la quantità di energia
utilizzata per l'estrazione.
Se il giacimento è di fondale
oceanico sarà necessaria una
piattaforma petrolifera, quindi
un ancor maggiore dispendio
di energia e denaro.
Una volta estratto, il petrolio
va raffinato, ossia va diviso
nelle sue componenti.
Per far ciò si utilizza una
colonna di distillazione.
La distillazione avviene
riscaldando il petrolio, e
catturando i composti che ne
evaporano a determinati
intervalli di temperature.
Si ha così la produzione del
metano (CH4)

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  • 8. ALLA SERA Forse perchè della fatal quìete tu sei l'immago, a me si cara vieni o sera! E quando ti corteggiano liete le nubi estive e i zeffiri sereni, e quando dal nevoso aere inquìete tenebre e lunghe all'universo meni sempre scendi invocata, e le secrete vie del mio cor soavemente tieni. Vagar mi fai co' miei pensier su l'orme che vanno al nulla eterno; e intanto fugge questo reo tempo, e van con lui le torme delle cure onde meco egli si strugge; e mentre io guardo la tua pace, dorme quello spirito guerrier ch'entro mi rugge.
  • 9. Il petrolio è una miscela di idrocarburi di vario peso molecolare. Un idrocarburo è un composto formato da un numero variabile di atomi di idrogeno (H) e carbonio (C) Lo sfruttamento di un giacimento petrolifero viene eseguito tramite vari tipi di strutture che cambiano a seconda della posizione del suddetto giacimento: Se il giacimento è molto superficiale e su terra emersa si useranno delle pompe, che mandano giù acqua ed estraggono petrolio. Se il giacimento è di terra emersa ma più profondo, l'estrazione sarà più costosa perché ad una pari quantità di petrolio estratta sarà maggiore la quantità di energia utilizzata per l'estrazione. Se il giacimento è di fondale oceanico sarà necessaria una piattaforma petrolifera, quindi un ancor maggiore dispendio di energia e denaro. Una volta estratto, il petrolio va raffinato, ossia va diviso nelle sue componenti. Per far ciò si utilizza una colonna di distillazione. La distillazione avviene riscaldando il petrolio, e catturando i composti che ne evaporano a determinati intervalli di temperature. Si ha così la produzione del metano (CH4)