How Trees Bend the Laws of Physics
Hope this was worth the wait! So many people helped with this video: Prof John Sperry, Hank Green, Henry Reich, CGP Grey, Prof Poliakoff, my mum filmed for me in beautiful Stanley Park and Jen S helped with the fourth version of the script.
Prof John Sperry http://biologylabs.utah.edu/sperry/john.html
Hank Green (SciShow) http://www.youtube.com/user/scishow
Henry Reich (minutephysics) http://www.youtube.com/user/minutephysics
CGP Grey http://www.youtube.com/user/cgpgrey
Prof Poliakoff (Periodic Videos) http://www.youtube.com/user/periodicvideos
Also thanks to the Palais de la Decouverte - they helped me with the whole vacuum pump setup in Paris. No, I could not actually suck water up 10m - I did about 4m, but the vacuum pump was easily able to do it and I saw spontaneous boiling on all of our various trials. Footage from this may end up on 2Veritasium.
Trees create immense negative pressures of 10's of atmospheres by evaporating water from nanoscale pores, sucking water up 100m in a state where it should be boiling but can't because the perfect xylem tubes contain no air bubbles, just so that most of it can evaporate in the process of absorbing a couple molecules of carbon dioxide. Now I didn't mention the cohesion of water (that it sticks to itself well) but this is implicit in the description of negative pressure, strong surface tension etc.
Видео How Trees Bend the Laws of Physics канала Veritasium
Prof John Sperry http://biologylabs.utah.edu/sperry/john.html
Hank Green (SciShow) http://www.youtube.com/user/scishow
Henry Reich (minutephysics) http://www.youtube.com/user/minutephysics
CGP Grey http://www.youtube.com/user/cgpgrey
Prof Poliakoff (Periodic Videos) http://www.youtube.com/user/periodicvideos
Also thanks to the Palais de la Decouverte - they helped me with the whole vacuum pump setup in Paris. No, I could not actually suck water up 10m - I did about 4m, but the vacuum pump was easily able to do it and I saw spontaneous boiling on all of our various trials. Footage from this may end up on 2Veritasium.
Trees create immense negative pressures of 10's of atmospheres by evaporating water from nanoscale pores, sucking water up 100m in a state where it should be boiling but can't because the perfect xylem tubes contain no air bubbles, just so that most of it can evaporate in the process of absorbing a couple molecules of carbon dioxide. Now I didn't mention the cohesion of water (that it sticks to itself well) but this is implicit in the description of negative pressure, strong surface tension etc.
Видео How Trees Bend the Laws of Physics канала Veritasium
Показать
Комментарии отсутствуют
Информация о видео
Другие видео канала
How Hidden Technology Transformed BowlingThese are the asteroids to worry aboutThe Bizarre Behavior of Rotating BodiesThis Unstoppable Robot Could Save Your LifeThe Illusion Only Some People Can See3 Perplexing Physics ProblemsWhy Mosquitoes Bite Some People More Than OthersWhy You Should Want Driverless Cars On Roads NowWhy Do Venomous Animals Live In Warm Climates?The Longest-Running Evolution ExperimentWhat Exactly is the Present?Why Apollo Astronauts Trained in Nuclear Bomb CratersHow Was Video Invented?How Were the Pyramids Built?A Physics Prof Bet Me $10,000 I'm WrongThe Biggest Myth In EducationHow to Slow Aging (and even reverse it)Turbulent Flow is MORE Awesome Than Laminar FlowHalf the universe was missing... until nowHow Kodak Exposed The Atomic Bomb