Laboratory determination of the dif-fusivity of vapor is done by __________ method.

Solution (By Examveda Team)

The laboratory determination of the diffusivity of vapor refers to the process of measuring how a vapor diffuses through a medium. The following methods are considered for this purpose:

Option A: Wetted wall column → Correct. The wetted wall column method is a standard laboratory technique used to measure the diffusivity of vapors. It involves a column where liquid is continuously circulated over the surface, allowing the vapor to diffuse through the liquid. By measuring the rate of vapor absorption, the diffusivity can be determined.

Option B: Gilliland's → Incorrect. Gilliland's method is typically used to determine the efficiency of packed towers or to predict the performance of absorption and distillation columns. It is not specifically used for measuring diffusivity of vapor.

Option C: Winkelmann's → Incorrect. Winkelmann’s method is not a standard method used for the laboratory determination of vapor diffusivity. It is more related to other fluid dynamics and heat transfer processes.

Option D: Wike's → Incorrect. Wike’s method is not a widely recognized method for determining vapor diffusivity in laboratory settings.

Thus, the correct answer is Option A: Wetted wall column, which is specifically designed for determining vapor diffusivity in laboratory conditions.