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Bosic asump tions
Consist of moteCLLles and They ane ia'
OAee qases espect.
sphue identtcal in ale
The sige of motocule a nyglalebnoleen ompa
between the
the aueape dutanee
Tha molecules sc in the Stafe of con tinuu
Tmotin, maiy in all directian uith al preita,
ODwring tha andom motion, the moloueoy roe
th ah another and uith tho
enel
perledey elastic ard
ae no frees of attrtion on Hepulsin
the molecule
) Betueon t o Caelisns molcle Mae in
a straight path wtth a uniportn elouit a
Quepe distane covere by a
tuo Sucessive Collision callad
path
The colliian1 e Qlmat inatantaresu
) Inspte of moloulax coelisins, the density xeman
tomains
unitoTn thaushout tha gas
" Pressure exected by a ges
Consido an ideal gas contained in a
wbical vessel. let the sideg f a cube
Re parallel to the cordinate axis. lat
be the no. pr unit
volume and be te man
, classMate
Date
Page 226
Suppose mlacue wth veloty( . , ) hits the pbne
perpendicuta to ox-axis hauring ayca A. As coliSm u
lastic t we Habond with theSamc veloity wheres
and 3 3 Compment wie not change. o change in
momerntu f th mmolacle
- mv- mv -2mv
Consetation momentum..
the momontum iateo to the wal in each
coligimm
gn Sma0e time ae thse moeoulos which ie
At
within a dustanca UAt wiel hit the wal0.
So the mofcule whid ie in the volume, AAVLt
wjel hit the wale in time At. On an avoege
hall. of the motecules Qre moing toards he
Ona ofhse hall auay Prom tthe wae.
. o. molaculey hitting the uwale in timu bt a
Thotpore total morentum transperead to the wall in
tme At
p
force. exexded on the wall
Pressura on the wale
A
As molecules mare with dant veloaties so we wiee
P= nm v
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