Diffusion

Matter flow velocity

Matter flow velocity

________ (I) is number of particles that pass within a given time.

Diffusion

________ is faster in low viscosity media than in high viscosity media.

Average distance

________ (R) is proportional to the square root of Diffusion coefficient (D) × time.

Matter flow density

________ (J) is amount of particles with time divided by area (A)

gas exchange

In ________ between lungs and bloodstream, oxygen and nutrient transport to tissues and cells from bloodstream, waste products of metabolism is transported to the blood.

Particle properties

________ determining diffusion coefficient.

constant motion

A container split into two parts, the molecules in both sides are in ________ and collide with themselves and the wall of the container.

Ficks 1st law matter flow density

________ is linearly proportional to concentration and diffusion gradient.

spherical particles

In ________, environmental factors relate with the diffusion coefficient.

higher concentration

The particles move from a solution of ________ to lower concentration till we achieve a homogeneous distribution.

Diffusion

________ is the movement of particles from an area of higher concentration to an area of lower concentration over time by random thermal motion.

diffusion

It indicates that ________ is faster for smaller particles.

Example

gaseous exchange between the blood and the lungs; for CO2 R is 1micrometer, D is 1.2 × 10^-8 time is about 0.5s

Stokes

D = 𝑘/6𝜋 × 𝑇/𝜂𝑟

Relationship between diffusion time and mean displacement

R~√2𝐷𝑡 ×𝑡

Diffusion for particle size

diffusion is faster for smaller particles.

Diffusion coefficient

particle properties determining diffusion coefficient.

Effect of concentration on diffusion

Increase in concentration leads to increased diffusion rate

Cause of diffusion

Due to the uneven(inhomogeneous) distribution of particles

Difference between diffusion and osmosis

Diffusion needs no permeable material