surface tension alveolus to connect the misen micro surface tension sensor and the liquid channel the gas liquid interface in the mista has the maximum curvature or capillarity so the gas liquid interface can be stopped here thus the position of the gas liquid interface shows the gas pressure the triangular microchannel performs the assignment of the micro surface tension sensor if the liquid pressure is fixed the micro surface tension sensor can be used to measure the gas pressure fig2 a fig2 b and fig2 c are schematic views of a micro surface tension valve misva the micro surface tension valve includes a gas channel 21 and three liquid channels 22 23 24 which are formed in a chip one end of the gas channel 21 is in communication with a gas another end of the gas channel 21 communicates with one end of the liquid channel 22 through a tapered microchannel 25 two sides of the microchannel 25 are respectively in communication with one end of the liquid channel 23 through a tapered microchannel 26 mista to function as a liquid inlet and one end of the liquid channel 24 through a tapered microchannel 27 mista to function as a liquid outlet the other ends of the three liquid channels 22 23 24 are respectively in communication with a liquid because the greater pressure difference between the gas phase and the liquid phase inside the mista can.