Item no.: P3010301

Principle

Diffusion arises from the flow of matter down a concentration gradient. In the evaporation method, a stationary concentration gradient is achieved in which the concentration decreases linearly with distance. Under these conditions the diffusion coefficient of the diffusing substance may be calculated by a direct application of Fick’s first law of diffusion.

Tasks

Measure the diffusion coefficient of bromine in air using an evaporation method.

What you can learn about

• Kinetic theory of gases
• Transport properties
• Fick’s laws of diffusion
• Self and mutual diffusion coefficients
• Alternative techniques e.g. Loschmidt’s method

Necessary accessories

• Precision balance 620g/0.001g