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what is the difference between P=hdg and P=vdg. when and where should we use both of them.are the both same?

what is the difference between P=hdg and P=vdg.
when and where should we use both of them.are the both same?

Grade:9

2 Answers

Umakant biswal
5349 Points
7 years ago
@ arun 
both formula are nearly same , both defines the formula for buyoncecy , the only thing that u need to understand is that 
we use h = pdg in the case of gas where volume expansion takes place , 
and we use p = hdg is the case of liquid expansion . 
HOPE IT CLEARS ..
shipra dixit
25 Points
6 years ago
P=hdg..This is the pressure exerted by a liquid column. Here P is directly proportional to h and d and not proportional to g.If density of a liquid is increased and if h is increased then P will also increase.
P=vdg..we know upthrust=vpg
upthrust=mass*g( v*p=m)
              =mg 
upthrust is force by water on body in upward direction. in this case P= vpg
 

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