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= −γ
∂x ∂y
∂z
dp
= −γ
dz
si γ = cte
∆p = γ∆z
p2
z2
p1
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∫ dp = −γ ∫ dz
⇒
⇒
∆p = γ h
p2 − p1 = γ ( z1 − z2 )
∆p
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p 2*A
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=
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A
e*l
e
p * y FH * l
pl 2 R − y FH
T
⇒ σ2 =
σ2 = 2 =
A
e *l
e
σ1 =
(
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