Which of the following is not a sample size reduction technique for solid samples?

• A. Grinding
• B. Stirring
• C. Crushing
• D. Blending

Answer: (B)

The main idea is that sample size reduction means physically breaking solid material into smaller particles to improve representativeness and dissolution. Crushing and grinding are classic methods that actually reduce particle size by fracturing or abrasion, increasing surface area for subsequent analysis. Blending, on the other hand, is about mixing portions to achieve a uniform composition; it doesn’t change how large the individual particles are. Stirring is simply agitation to mix or suspend materials and does not reduce particle size at all. Therefore, stirring is not a sample size reduction technique for solid samples.