What does "TD" stand for in volumetric glassware markings?

In volumetric glassware markings, "TD" stands for "To Deliver." This indicates that the glassware is calibrated to deliver a specific volume of liquid when the contents are poured out. The design ensures that the full volume indicated is transferred effectively to another container without any liquid remaining in the original glassware.

This quality is important in laboratory settings, particularly for precise measurements and reactions where the volume of reagents must be exact. When using glassware marked "TD," it is essential to allow any residual liquid to remain in the container, as it is designed to account for the entire volume.

Other options convey different meanings, but they do not correlate with the convention used for volumetric markings. For example, "To contain" refers to glassware calibrated to hold a specific volume, which does not account for any liquid that might be left behind when the contents are poured out. "Totally dry" and "Temperature dependent" are not standard terms related to volumetric markings and do not have relevance in this context.