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FYSICAA
T3H2: Druk in en op een vloeistof
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Created by
Emma Verhulst
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Cards (13)
Wet (beginsel) van
Pascal
Druk
op
een
vloeistof
(gas)
De druk
op
een vloeistof
plant
zich
voort
door die vloeistof heen, in alle
richtingen
,
ongewijzigd
(zelfde grootte).
Toepassing van druk op een vloeistof =
hydraulische pers
Hydraulische pers: hydraulische
lift
(brug in autogarage),
laadbak
vrachtwagen, hydraulische
rem
(autorem)
Hydrostatische
druk
in
een vloeistof
Druk door een
stilstaande
vloeistof uitgeoefend (als gevolg van de
Fz
)
Phydro = Fz / A =
m
.
g
/A
Phydro = Pvl . V . g / A
Phydro = Pvl . A . h . g / A
Phydro
=
Pvl
.
h
.
g
Phydro
= Pvl . h . g
--> eenheid = kg/m³ . m . N/kg = N/m² =
Pa
Totale druk
in
een vloeistof
Ptot = Pvl .
h
+
Pop
Totale
druk:
Ptot
=
Phydro
+
Patm
(
open
vat)
Algemeen
:
Ptot
=
Phydro
+
Pop
(
gesloten
vat)
In open verbonden vaten staat 1 vloeistof steeds even
hoog
, wat ook de vorm of
doorsnede
van het vat is
In een open U-vormige buis gevuld met 1 vloeistof, is het
vloeistofniveau
in beide buizen even
hoog
In eenzelfde horizontaal vlak van 1 vloeistof is de druk overal
gelijk
Toepassingen wet van de verbonden vaten:
Peilglas
,
watertoren
,
sluizen
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