What type of glassware is labeled "TD" (i.e., "to deliver")?

The designation "TD," or "to deliver," refers to glassware that is intended to deliver a specific volume of liquid accurately. In this case, syringes fit this definition because they are designed to transfer a precise volume of liquid from one location to another. When using a syringe, the volume indicated on the scale represents the amount of fluid that is intended to be delivered, making it suitable for applications where exact dosing is crucial, such as in medication administration.

In contrast, volumetric flasks are primarily labeled "TC" or "to contain," meaning they hold a specific volume but may not deliver that volume accurately when poured due to residual liquid left on the inner surfaces. Beakers and measuring cups also generally indicate volumes for containing liquids rather than delivering a precise volume, as their primary function is not for exact measurements or dosing. Therefore, syringes are correctly identified as "TD" glassware for their role in delivering accurate volumes.