C.I.A Bomb
today finally do CIA....wasnt really clear...realised no one actaully understood my part abt the gas thermostat........anw.the main pt is tt after everything is done, the Q&A n etc. i thought: tts it! finally done n over with.i knew it was not gonna b to nice a grade liao..den...BOMB..she had to comment saying tt our CIA has nth to do with gaseous state.1:how can we use pressure law to explain since volume is not const (?? really meh??)
2:moreover, since refrigerant is at low bp (much lower den room temp. eg. propane's is -42.1
Celcius) i.e it wld evaporate => take in heat => coolin effect. nth to do with pV=nRT.
IT IS THERMODYNAMICS!
okay.i thought abt it.ya.she is right.but wait.we cant be tt wrong can we? i mean, most of the webbies we look through all says the same thing.
pressure increase => temp increase
pressure decrease => temp decrease
i.e pressure law.
here comes the question.how to show her tt pressure law is impt?
given a chance to deliberate abt this at home. i.e from 6.30pm till this very moment..
i surfed the webbie stopping onli for dinner. i came to a conclusion, i cant explain. i tried to use examples with numbers, real facts that can b used (specific latent heat etc.) den i realised its no use..zzzzzzz
i stopped...i think...n i just had to blog abt this cause
1). dam long nv blog
2). i nd to organize my thoughts.
so why not? 一举两得
and den..it struck me as i am typing this blog entry...the problem is soooo simple!!!!!
rebuttal to 1:
firstly, expansion => volume increase => pressure drops (Boyle's law)
then, as pressure drops => temp drops (pressure law)
they dun happen together!
at the instant when vol increase, pressure wld drop (temp is const)
at the instant pressure drop, temp drop (vol wld hv stopped increasing i.e const vol!)
rebuttal to 2:
since it has a much lower bp, when it is in condenser, liquid wld hv turned into gas alrdy.so coolin effect wld happen at the condenser! and it wld hv thermal equilibrium with room temp! i.e when it passes thru evaporater, instead of cooling effect, it keeps the inside of refrigerator same to room temp! heat travels from hotter to colder (hmm...so ppl who sit ard marcus gonna b dam hot too?)
in other words...a non-cooling refrigerator...
ya...i shall stop thinkin abt this..the more i think abt it...the more problems i think off..more headaches and confusion
heck.
jem toked kok @ 5/04/2006 08:29:00 pm
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