Question

How much pressure would be required to raise water to the top of a $416$ ft. high tree ?

• A. $1$ atm
• B. $13$ atm
• C. $-77$ bars
• D. All of the above

Answer 1

The correct option is B $13$ atm

One atmospheric pressure can raise water to a height of more than $32$ feet. So a pressure of about $13$ atmospheres would be required to raise water at the top of a $416$ feet high tree. The tension developed in the xylem sap of trees that are actively transpiring can be measured only indirectly and has been found to be high as $-77$ bars.