For pipettes marked with To Deliver (TD), a small amount remaining on the tip should not be blown out.

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Multiple Choice

For pipettes marked with To Deliver (TD), a small amount remaining on the tip should not be blown out.

Explanation:
The key idea is that pipettes marked To Deliver are calibrated to deliver the stated volume even if a small amount remains in the tip. Leaving that tiny residual liquid in the tip is intentional and expected; blowing it out would deliver more than the nominal volume and cause inaccuracy. So, for TD pipettes, you should not expel the last drop. If you needed to deliver all liquid, you’d use a pipette marked To Contain instead.

The key idea is that pipettes marked To Deliver are calibrated to deliver the stated volume even if a small amount remains in the tip. Leaving that tiny residual liquid in the tip is intentional and expected; blowing it out would deliver more than the nominal volume and cause inaccuracy. So, for TD pipettes, you should not expel the last drop. If you needed to deliver all liquid, you’d use a pipette marked To Contain instead.

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