Ok open student's book
pages : 89
90
94
114
156
160
(Pa = 1 a.t.m)
bs fe mola7za keda ,
Pa = 1 atm
pa = pascal
y3ny a2sod , en 7rf el (a) lma bikon t7t el (p) bikon el ma2sood dght gawy .
Laken lma bikon gnb (p) , bikon el ma2sood pascal .
In page 397 ,
Pa , da el ramz el sha2e3 msh w7det el kias .
For more info : read in Wikipedia
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