Lesson 6 Flashcards
Surface tension notes
write task
Important for human resp. alveoli Laplace law, it compensates pressure in alveoli and help them not to collapse
adhesion and cohesion. attraction between same/diff type molecules.
know molecular explanation of surface tension
molceules in surface wants to stay in water, layer on typ of surface is stronger than attraction forces in the middle
surface tension = see floating objects, has elastic properties, resist deeformation
måååånga factprs som påverkar surface tension
we shpuöd use N/m
OBS measuremens are in mN
theoretical values in presentation
alveoli is special, outside press in there, depends on the size! Laplace Law - smaller - bigger N
surfactant = doesnt allow alveoli to shrink. Covid damages this surfactant in the alveoli - damaging production of surfactant!
Use lotus effect, apply it in diff. situation eg in surgeries.
Capillary rise, depends om substance and diameter of straw.
capillary depression (mercury)
apply 3rd newton law, amopunt of force is aame only opp. direction
removing
apply force, tru to temove it from substance
