PHYS 1080 Lecture Notes - Lecture 10: Gamboge, Atmospheric Pressure
23 Mar 2016
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Study guide 16 (section 4) and study guide 17 (sections 1-4) In many cases, the probability that some state" exist (ex. A particle with energy e) is given by boltzmann"s distribution: (see note from nov 17) Experiments similar to perrin"s (e1 = (p - pf)vgh1) In the barometric equation, gravitational potential energy was: u = mgh = pvgh. For a particle suspended in a liquid, the effects of gravity are reduced by buoyancy: u = (mg- Brownian motion of pollen grains should be similar to motion of molecules in the atmosphere. Put particles in jar of water to see if, like atmosphere, there were fewer near surface than farther below. If particles are less dense than water, they will float (buoyancy) If there were too dense, they would sink to the bottom of container (sedimentation) Used microscopic gamboge particles just slightly more dense than water. Stir and allow gamboge particles to settle; count number of particles using microscope.
