1.7. Flux and Diffusion

Try these first

1. 1.

   Define flux in your own words.

   Hint

   Think of it as a flow rate.

2. 2.

   What does diffusion describe?

   Hint

   Consider how scents spread in a room.

3. 3.

   What does flux measure?

   • A. Rate of a substance per unit area
   • B. Total concentration in a volume
   • C. Temperature changes
   • D. Resistance to movement

   Hint

   Consider how we measure flow.

4. 4.

   True or False: Diffusion requires stirring.

   • True
   • False

   Hint

   Recall how food coloring spreads.

5. 5.

   If an oil spill has a diffusion coefficient of 0.2 m²/s and creates a concentration gradient of 10 mg/m³ across 3 m, find the flux.

   Hint

   Apply the formula to get the answer.

6. 6.

   Discuss how increasing temperatures might affect the diffusion coefficient of a pollutant in water.

   Hint

   Think about how heat affects how freely substances move.