Why do mustard seeds stick to the polythene packets when being poured out?

The electrostatic force is responsible for the adherence of mustard seeds to the polythene packets when being poured out. There is a buildup of static charges on the seeds and the plastic wrapping, which results in an attractive electrostatic force that results in the adherence of the seeds to the plastic surface.

1. Friction: When mustard seeds rub against the polythene packets, they generate static charges. This electrostatic charge creates a strong adhesive force between the seeds and the plastic surface, causing them to stick together.

2. Polarity of Materials: Both mustard seeds and polythene packets have different polarities. The seeds have a slightly positive charge, while the packets have a slightly negative charge. This difference in polarity also contributes to the electrostatic attraction between the two surfaces.

3. Shape and Size of Seeds: The small size and irregular shape of mustard seeds further enhance the chances of them getting trapped within the crevices and irregularities on the polythene surface, making it more difficult to pour them out smoothly.

To minimize this issue, anti-static agents can be added to the packaging material or the seeds can be treated with a conductive coating to reduce the buildup of static charges and improve flowability. Additionally, increasing the humidity level in the environment can help reduce static electricity buildup and make the seeds less prone to sticking.

In conclusion, the electrostatic force arising from friction between mustard seeds and polythene packets, combined with the polarity differences and the shape of the seeds, is the primary reason why mustard seeds tend to stick to the packaging during pouring.