Question

The fluid flows through the filter medium by virtue of:

• A. Pressure difference across the filter
• B. Temperature difference across the filter
• C. Volume difference across the filter
• D. Potential difference across the filter

Answer 1

The Correct Option is A

In the field of pharmaceutical engineering, understanding the principles of fluid flow through a filter medium is crucial. The question asks which factor drives the fluid to flow through a filter medium.

The correct answer to the question is: Pressure difference across the filter.

Here's the step-by-step explanation:

1. When a fluid is filtered, it's pressed against the filter medium. The primary force facilitating the movement of fluid through the filter material is the pressure difference between the upstream (the side where the fluid enters) and the downstream (the side where the fluid exits) of the filter.
2. The pressure difference can be achieved by applying an external force, such as a pump, which pushes the fluid through the filter medium.
3. This pressure difference is essential as it overcomes the resistance offered by the filter medium and forces the fluid through it, allowing the separation of solids from liquids.
4. Other options such as temperature difference, volume difference, and potential difference are not relevant to the mechanism through which a filter operates. Filtering due to temperature differences typically involves processes like distillation, and volume or potential differences generally relate to electrical or capacitive processes.

Conclusion: In filtration processes, pressure difference is the driving force that moves the fluid through the filter. Without it, the filtration would not occur efficiently as the fluid would not pass through the filter medium effectively.