Patent ID: 6843121

Claim:
A method of measuring absolute static pressure at one or more positions along the wall of a microfluidic device transporting a working fluid that is immiscible in a first selected gas environment, comprising: (a) providing a first fluid conducting channel having an atmosphere provided by the first selected gas environment in a sealed environment and in communication with the microfluidic device at a first point of communication; (b) providing a first sensing mechanism that is electrically interrogated, disposed adjacent to the first fluid conducting channel; and (c) transporting the working fluid under pressure conducted by the microfluidic device into the first fluid conducting-channel such that the volume transported into such first fluid conducting channel varies depending upon the absolute static pressure of the working fluid at the first point of communication, whereby the absolute static pressure at the first point of communication is electrically determined by the first sensing mechanism depending on the position of the interface of the working fluid and the first selected gas environment in the first fluid conducting channel.