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3 cards from this section. Quick, good the night before a test.
What is effective diffusivity (DA3)?
Think about how substances migrate through different materials.
Define porosity.
It relates to how much space exists within solids.
What does DA3 represent in diffusion studies?
Think of it as the rate of movement through porous materials.
True or False: Higher porosity increases diffusion rates.
Relate this to paths available for substances.
A contaminated site has a porosity of 0.25 and an effective diffusivity of 2.5e-5 m²/s. If the retardation factor is 1.5, calculate the rate of contaminant movement over time.
How does the retardation factor influence the overall migration speed?
Assuming a linear concentration gradient exists across a distance of 4 meters with a given effective diffusivity of 1.2e-4 m²/s. How long will it take for the substance to cover this distance?
What is the formula for time based on distance and diffusivity?
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