Related Questions

Consider the following statements regarding the importance of diffusion and choose the correct answer:
1. The exchange of gases takes place by the principle of dependent diffusion
2. The process of diffusion is involved in transpiration of water vapours
3. The ions are absorbed by the simple diffusion during passive salt uptake
4. Diffusion is an effective means of transport of substances over a very short distance and helps in the translocation of food materials
In a gas mixture of hydrogen and oxygen, steady state equimolar counter diffusion is occurring at a total pressure of 100 kPa and temperature of 20°C. If the partial pressures of oxygen at two planes 0.01 m apart, and perpendicular to the direction of diffusion are 15 kPa and 5 kPa, respectively and the mass diffusion flux of oxygen in the mixture is 1.6 * 10–5 kmol/m2.sec, calculate the molecular diffusivity for the system. For equimolar counter current diffusion:
Concentration of hydrogen gas across a 2mm thick palladium sheet differs by 4 kg/m3. Considering steady-state diffusion with diffusion constant 10-10 m2/s, diffusion flux is ______ kg/m2.s:
Diffusion through grain boundaries is very fast and is called short-circuit diffusion. Assertion: Their contribution to overall diffusion is negligible.
Transport mechanisms that do not contribute to densification during sintering are:
P. Surface diffusion
Q. Bulk diffusion
R. Bulk diffusion
S. Evaporation-condensation
T. Viscous flow
Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as
Ordinary diffusion process is also called __________ diffusion.
Diffusion is a common process in fluids, but diffusion in solids rather than of solids is more likely.
In the fabrication of monolithic ICs, Boron chloride is added as an impurity in the diffusion process. Find the diffusion time, if the furnace is heated up to 1200oc.
In order to describe the transport process in a ternary diffusion system, we need 4 inter-diffusion coefficients. Why?