## Does sugar affect rate of diffusion?

In some aqueous sugar solutions, solute crystallization at high solute concentration or low temperature can be inhibited due to an increase in viscosity and associated decrease in the rate of diffusion within the solution as it supersaturates or supercools.

## What is the diffusion coefficient of glucose?

The diffusion coefficients of glucose and mannitol in water are 5.2 × 10−6 cm2/s (at 15°C) and 6.05 × 10−6 cm2/s (at 20°C), respectively (Grigoriev and Meylikhov, 1991).

Does the diffusion coefficient depend on the gas?

Wilke and Lee noted the coefficient 1.885Ч10−2 is not constant in reality and depends on molecular masses of the diffusing gases: This accurate definition results in a better agreement between experimental and computed data.

### What slows the rate of diffusion of glucose into a cell?

A lower temperature means less energy in the molecules, so they will move at a slower speed. Lowering temperature also decreases the kinetic energy of the molecules in the plasma membrane, compressing them together. This increases the density of the plasma membrane, which slows diffusion into the cell.

### Which of the following factor can affect the rate of diffusion of gases?

The rate of diffusion is affected by the concentration gradient, membrane permeability, temperature, and pressure. Diffusion takes place as long as there is a difference between the concentrations of a substance across a barrier.

What increases diffusion coefficient?

The diffusion coefficient is a function of the fluid, size of the diffusing molecule (larger molecules diffuse more slowly), temperature, obstruction of diffusion by pore structure in sediments or other materials, and the rate of mixing of water.

## Which gas has the highest rate of diffusion?

As per Graham’s law, the rate of effusion or diffusion is inversely proportional to the square root of its molecular weight. Consequently, the gas with the least molecular weight effuses the fastest hence, helium gas has a higher rate of diffusion compared to nitrogen or oxygen.

## What is the coefficient of diffusion in gases?

Diffusion in gases. For ideal gases, the diffusion coefficient does not depend on substance concentration. In accordance with the kinetic theory of gases, the mean free-path length l of molecules is inversely proportional to the mean cross-sectional area of the molecule S and the number density of the molecules n in a mixture.

How do quantum effects affect gas diffusion coefficient?

Quantum Effects on Diffusion Coefficients Quantum effects become significant when the de Broglie wavelength, A=hllLv, approaches the size parameter 0″. Thus the ratio AjO” is a measure of quantum effects, and gases behave classically for A/O” ~ 1.

### Are there any short catalogs of measured diffusion coefficients?

Short catalogs of measured diffusion coefficients have previously appeared in the International Critical T~bles [1],1 the Landolt·Bornstein Tables f2], and the Thermophysical Properties Research . Literature Retrieval Guide [3].

### How does temperature affect the diffusion coefficient of sulfuric acid?

The diffusion coefficient of sulfuric acid is a function of acid concentration, where its value at T = 25 ∘ C is [60] To include the effect of temperature on the diffusion coefficient, Newman and Tiedeman [59] gave the following relation: It is quite evident that Eq. (6.72) gives a relation for sulfuric acid binary diffusion in a nonporous medium.