BIOL 205 Lecture Notes - Lecture 10: Volumetric Flow Rate, Hygrometer, Thermocouple
Document Summary
Biol 205 biology of organisms-lecture10 properties of water: high dielectric constant. A dipole molecule; will rotate in magnetic field. Oxygen is partially negative, hydrogen particle positive. Can dissolve a variety of molecules and ions. In solution, oxygen atoms orient towards cations (+), hydrogen atoms orient towards anions (-: stable and high heat capacity. Helps maintain relative constant body temperature: cohesive fluid. Water potential: water potential is the driving force (which is a special case of chemical potential) Chemical potential describes how free are molecules to move: water potential is a composite of forces contributing to water movement. Yp pressure potential e. g. hydrostatic/turgor pressure almost always 0 (facilitates water movement out of the cell) only becomes negative in very tall trees due to suction and high tension. Y /ys osmotic/solute pressure due to presence of solutes ions immobilize water molecules. From soil to roots: water in soil moves as bulk flow, water enters the root cells, determined by matric pressure.
