Gas pressure

Diagram below shows a manometer is connected to a gas supply. 

Rajah di bawah menunjukkan sebuah manometer disambungkan ke bekalan gas.

 
 


Gas pressure is equal to
Tekanan gas bersamaan dengan 
 
A    6 cm of water + atmospheric pressure.
6 cm air + tekanan atmosfera 
 
B    8 cm of water + atmospheric pressure.
8 cm air + tekanan atmosfera 
 
C     Atmospheric pressure 6 cm of water.
Tekanan atmosfera 6 cm air 
 
D    Atmospheric pressure 8 cm of water.
Tekanan atmosfera 8 cm air
 
 
 
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Answer/Jawapan
 
B