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can someone explain negative ATM (atmospheric pressure?)?
im really confused on how can atm become negative, ive read a couple of articles and videos saying that this only applies to liquids and not gas, because gas stops at 0atm or a vacuum.
thanks!
this video explains that trees are able to get water up to 100meters because the xylum of the tree can adjust its atm for the water within it. but, im still really confused and really dont understand the concept of negative atm. |
http://www.youtube.com/watch?v=BickMFHAZR0&feature...
bc gas laws states, if pressure goes up, vol goes down. if temp goes up, vol goes up.
so would that mean that the lower the pressure, the colder it becomes? ...
2 Answers
- Caroline MillerLv 79 years agoFavorite Answer
negative pressure is when the atmosphere in a container is less than that of the environment
in a tree, water at the leaves is lost to transpiriation, this causes the pressure in the xylem tubes to be less than that in the atomsphere. therefore, the pressure pulling the fluid plus adhesion of the fluid to the xylem and cohesion of the fluid that results in an increased surface tension causes the fluid to flow upwards towards the leaves.
the link below gives good descriptions/images
- 9 years ago
I've honestly never heard of negative pressure. The only thing I can think of that applying to is a solution in a vacuum where the pressure is being removed from a air sealed vessel. Maybe that's what it refers to but otherwise I can't really wrap that concept around my head.
