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2015 ; 5
(ä): 16790
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The height limit of a siphon
#MMPMID26628323
Boatwright A
; Hughes S
; Barry J
Sci Rep
2015[Dec]; 5
(ä): 16790
PMID26628323
show ga
The maximum height of a siphon is generally assumed to be dependent on barometric
pressure-about 10?m at sea level. This limit arises because the pressure in a
siphon above the upper reservoir level is below the ambient pressure, and when
the height of a siphon approaches 10?m, the pressure at the crown of the siphon
falls below the vapour pressure of water causing water to boil breaking the
column. After breaking, the columns on either side are supported by differential
pressure between ambient and the low-pressure region at the top of the siphon.
Here we report an experiment of a siphon operating at sea level at a height of
15?m, well above 10?m. Prior degassing of the water prevented cavitation. This
experiment provides conclusive evidence that siphons operate through gravity and
molecular cohesion.