Final answer:
Tapping the mold and vacuuming the mixture are effective strategies to minimize voids from air trapped in a powder mixture. Increasing mixing time and speed carefully may also help, but using less water is not advisable.
Step-by-step explanation:
To minimize voids from air trapped in between powder particles and trapped while mixing, C. Tap the mold to release air bubbles is commonly employed. This technique helps in dislodging any trapped air that might have been introduced during the mixing process. Vacuuming the mixture before pouring is another effective strategy for removing air pockets, as it helps to extract trapped air from the mixture. Increasing mixing time and speed might also contribute to a better dispersion of particles and release of air, but it could potentially introduce more air if not done carefully. Using less water is generally not advised as it can lead to a drier mixture that is more prone to developing voids. It's best to follow the specific instructions for the material being used to achieve the optimal water content and consistency for minimizing air entrapment.