Hi. I have got two questions... 1. How can we determine the pressure at the boundary of two gas phases (say, compressed carbon dioxide released from a can and the atmosphere) which are originally separated? If we apply the ideal gas equation on each of these two phases, different pressures will be obtained, how do we determine the the value of the pressure at the boundary?? 2. The Pascal's Law states that "pressure exerted anywhere in a confined liquid is transmitted equally and undiminished in all directions throughout the liquid". I am wondering if such principle(same pressure at a point in all directions) still holds if the fluid is flowing? Thanks.