Which equipment would be best suited for collecting a dry pile of a substance?

The choice of using a plastic scoop for collecting a dry pile of a substance is appropriate because it is designed specifically for efficiently handling solid materials. A plastic scoop typically has a rigid structure that allows for easy and precise collection without disturbing the material too much, which is essential when dealing with powders or granules.

In contexts involving hazardous materials, the scoop's non-reactive properties help ensure that it does not chemically interact with the substance being collected, which is critical for safety and accurate handling. Moreover, the plastic construction prevents the risk of metal contamination or reactions, making it a safer choice for raw materials.

While other equipment like loosely woven fiberglass might be suitable for certain applications, it does not provide the necessary containment or precision for collecting dry powders. Disposable polyproplylene bailers are generally used for liquids, and a bomb sampler is primarily designed for environments where direct collection of solid samples from liquids is required, making them unsuitable for a dry pile. Hence, the choice of a plastic scoop is the most logical and effective for collecting a dry substance in a safe and efficient manner.