Which tool is commonly used to assist in mixing or transferring samples before centrifugation?

The funnel is commonly used to assist in mixing or transferring samples before centrifugation because it allows for easy pouring of liquids or powders into containers without spilling. The design of a funnel helps direct the flow of material into a smaller opening, which is particularly useful when handling samples that need to be transferred into centrifuge tubes or jars where precision is important. This tool ensures that the sample remains uncontaminated and minimizes the risk of loss during the transfer process.

The balance scale is primarily used for measuring weight, and while it is essential for quantifying samples, it does not assist in mixing or transferring. Stitch scissors are used for cutting, particularly in surgical contexts, and have no role in sample preparation for centrifugation. The graduated cylinder is useful for measuring volumes of liquids accurately but is not designed for transferring samples or mixing them effectively, as it lacks the shape that directs flow like a funnel does.