Diffusion in liquids and gases Use of Fick’s law Features - diffusive mass transport of substances in gases and aqueous solutions - application of Fick's law Learning objectives/experiments - fundamentals of diffusion: Fick's law - derivation of the calculation formula for the diffusion coefficients for the given experimental conditions - determination of the diffusion coefficient for the mass transport in gas - determination of the diffusion coefficient for the mass transport in liquid Specification [1] investigation of diffusion in liquids and gases [2] transparent tank with magnetic stirrer, conductivity meter and U-tube with capillaries for investigating diffusion in aqueous solutions [3] evaporation of a highly volatile solvent with a diffusion tube in a heated water bath for investigating diffusion in gases [4] removal of gaseous solvent at the upper end of the diffusion tube with a fan [5] heater with controller and sensor for adjusting the temperature in the water bath [6] height-adjustable microscope for monitoring and determining the solvent volume in the diffusion tube [7] separate display and control unit contains temperature display and fan Technical data Tank with stirrer: approx. 1500mL Speed stirrer: 0...1500min-1 253 capillaries made of stainless steel - diameter: 1mm, length: 5mm Water bath: approx. 2L Diffusion tube for solvent - diameter: 3,4mm, length: 85mm Power output heater: approx. 125W Fan: 120...320L/h Microscope scale division: 0,1mm Measuring ranges - temperature: 0...100°C - conductivity: 0...200mS/cm 230V, 50Hz, 1 phase 230V, 60Hz, 1 phase 120V, 60Hz, 1 phase UL/CSA optional LxWxH: 210x210x280mm (experimental unit for diffusion in liquids) LxWxH: 220x290x450mm (experimental unit for diffusion in gases) LxWxH: 370x340x200mm (conductivity meter) Weight: approx. 16kg