• 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


  • Investigation of diffusion of gases
  • Evaporation of a highly volatile solvent with a diffusion tube in a heated water bath for investigating diffusion in gases
  • Removal of gaseous solvent at the upper end of the diffusion tube with a fan
  • Heater with controller and sensor for adjusting the temperature in the water bath
  • Height-adjustable microscope for monitoring and determining the solvent volume in the diffusion tube
  • Digital display and control unit contains temperature controller and fan

Due to changes in concentrations, the process of diffusion involves the microscopic transport of particles including atoms, molecules, and ions. It is critical to a number of processes. Diffusion, for instance, has the ability to combine various reactants in chemical reactions. Gaseous A hot water bath and other components are included in the diffusion device, which uses a very volatile solvent. A vertical tube containing the solvent is submerged in a water bath. The solvent evaporates as a result of the water bath’s thermal energy. At the tube’s upper end, an air flow created by a fan travels horizontally. Due to the concentration gradient from the liquid solvent’s surface up to the flow of pure air, the gaseous solvent diffuses. The solvent molecules are carried away by the air flow, maintaining a constant concentration at the tube’s upper end. Over the time, the liquid solvent in the tube loses volume. It is possible to determine the level using a scale microscope. The temperature in the water bath is controlled by a heater.


Technical Data

  • Water bath: approx. 2L approx.

Diffusion tube for solvent

  • Diameter: 4mm
  • Length: 100mm


  • Power: 300W approx.
  • Fan: 120~320L/h


  • Microscope scale division: 0.1mm


  • Type: Blade
  • Drive: Motorized
  • Speed: 500rpm

Measuring ranges

  • Temperature: 100~400°C

Software: CRE-3301BSW (optional)

DAQ software specially designed in National Instrument™, LABVIEW™ environment to measure and calculate the results of apparatus. The software is optional and while using software a set of electronic sensors are included. Software can be run with any Windows™ environment.

Scope of Delivery

  • 1 Experimental unit
  • 1 Microscope to measure level in tube
  • 1 Stopwatch
  • 1 Set of instructional material