How trees suck wa­ter

Down to Earth - - SCIENCE -

THE MYS­TERY as to how trees pull wa­ter from the ground to their top branches has been solved. Sci­en­tists have dis­cov­ered that wa­ter can, in fact, be held in a vac­uum for al­most in­def­i­nite pe­ri­ods of time, and even un­der sig­nif­i­cant ten­sion with­out form­ing bub­bles or break­ing apart, which helps to ex­plain how trees siphon wa­ter to their high­est points. They also found that wa­ter can be pulled up to as much as 13.7 me­tres well above the baro­met­ric limit—the max­i­mum height wa­ter can be pulled—over­turn­ing the the­ory that stood for the last 400 years. Sci­en­tific Re­ports, De­cem­ber 2, 2015

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