CHE 150 Study Guide - Quiz Guide: Dioscorea Alata, Tmall
Document Summary
Triple point = point at which all three phases exist in equilibrium. Critical point = point above which liquid and gas are indistinguishable, known as a supercritical fluid. Smectic a = molecules are ordered in two dimensions (long axis and layers) Smectic c = molecules are ordered in two dimensions (long axis and layers which are tilted to either side) Nematic = only ordered in one direction (long axis) Cholesteric = layered at angles to each other, changes in temperature and pressure can change color of the substance. Lcd display: a thin layer of liquid crystal is placed between two conductive glass windows. The key to this device is that light is polarized. The liquid crystal twists the polarization of this light to horizontal as it passes through the liquid crystal. The newly horizontal light goes through a horizontal polarizer, hits a mirror, and goes back to the outside world (the person"s eye).
