| 摘要 |
<p>Receiving a first medium present in a first phase in a capillary device comprises receiving the first medium in the capillary device using a reduced pressure; and controlling the reduced pressure in such a way that it is less than a critical pressure at which exertion in the capillary device produces a surface tension. When the first medium has been completely received by the capillary device, the tension is overcome so that the second medium in a second phase, which is different from the first phase, is received by the capillary device. An Independent claim is also included for a device for receiving a first medium. Preferred Features: The capillary device is a pipette. The critical pressure in the capillary device is determined by the formula: P = 2.S/r, where: S = the surface tension produced by the first medium in the capillary device when the first medium has been completely received by the capillary device; and r = the radius of the capillary device. The first medium is a liquid and the second medium is a gas, or the first medium is a gas and the second medium is a liquid.</p> |
