What are the key differences between a TD and TC pipette, and how do these differences impact their use in laboratory settings?

The key differences between a TD (To Deliver) and TC (To Contain) pipette lie in their calibration and design. A TD pipette is calibrated to deliver a specific volume of liquid, while a TC pipette is calibrated to contain a specific volume. This means that when using a TD pipette, the entire volume is dispensed, whereas with a TC pipette, there may be a small amount of liquid left in the tip.

In laboratory settings, the choice between a TD and TC pipette depends on the level of accuracy and precision required for the experiment. TD pipettes are typically used when exact volumes need to be delivered, while TC pipettes are used when the total volume is important and any remaining liquid in the tip can be disregarded. It is important to use the appropriate pipette for each specific task to ensure accurate and reliable results.