Methods, systems, and computer program products for verifying dispensing of a fluid from a pipette

A method comprising:

• collecting pressure data while dispensing fluid from a pipette tip attached to a pipette, the pressure data including a plurality of pressure values measured at an internal portion of the pipette and taken over a given time interval, the plurality of pressure values including a maximum pressure value and a minimum pressure value;
• estimating a pressure range value between the maximum pressure value and the minimum pressure value;
• and
• responsive to the pressure range value being greater than or equal to at least one threshold, determining that the fluid included a liquid, or
• responsive to the pressure range value being less than the at least one threshold, determining that the fluid did not include a liquid.