What is the diffusion coefficient of CO2?

Carbon dioxide in air has a diffusion coefficient of 16 mm2/s, and in water its diffusion coefficient is 0.0016 mm2/s. Diffusivity has dimensions of length2 / time, or m2/s in SI units and cm2/s in CGS units.

What is diffusion CO2?

Diffusion of Carbon Dioxide This means that net diffusion occurs into the alveoli from capillaries. The carbon dioxide is then exhaled as the partial pressure in the alveoli is higher than the partial pressure in the external environment.

How do you calculate diffusivity?

Diffusion coefficient is the proportionality factor D in Fick’s law (see Diffusion) by which the mass of a substance dM diffusing in time dt through the surface dF normal to the diffusion direction is proportional to the concentration gradient grad c of this substance: dM = −D grad c dF dt.

What is the coefficient for CO2 in the balanced equation?

The coefficient of CO2 in the above equation is 8.

Why does CO2 diffuse faster than O2?

CO2 diffuses approximately 20 times faster across the alveolar-capillary membrane than O2 because of its much higher solubility in plasma.

How do you calculate the diffusivity of a gas?

The gas phase diffusion coefficient, DP, depends on the pressure of the bath gas (P, in the unit of Torr) and is related to the diffusivity (or pressure-independent diffusion coefficient), D (Torr cm2 s−1), by the following equation [16]: D=DP⋅P.

What is the solubility coefficient of CO2?

The carbon dioxide solubility coefficient is 0.0308 mmol litre−1 mm Hg−1 or 0.231 mmol litre−1 kPa−1 at 37°C. (Solubility increases as the temperature falls.)

What diffuses faster co2 or CO?

According to Graham’s law, the rate of diffusion of a molecule is inversely proportional to the square root of molecular mass of the molecule. So, molecular mass of CO= 38 and CO2 = 44. Thus, CO diffuses faster than carbon dioxide.

Which diffuses faster co2 or O2?

CO2 diffuses approximately 20 times faster across the alveolar-capillary membrane than O2 because of its much higher solubility in plasma. An erythrocyte spend an average of about 0.75 to 1.2 seconds inside the pulmonary capillaries at resting cardiac output.

What is gas diffusivity?

The diffusivity of a gas in a liquid is measured by making a laminar jet of the liquid pass through a gas and determining the rate of absorption. Agar solutions have been used to form gels in the form of spheres and these have been used to measure diffusivities of components through the gel.