Volume concentration problem
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As the title suggests: A helium leak test is to be carried out using a suction gun method, with a pressure of 0.1 MPa. The helium testing process requires at least 10% helium, with the remainder filled with air. The current practice is to first fill it with helium to 0.01 MPa, and then fill it with air to 0.1 MPa. So here’s the problem ； Will the volume concentration of helium still be 10% after doing this? How is it calculated? Seeking advice from experts, urgent! ! ! ! Waiting online
The volume fraction of helium is 10%, because its partial pressure is 10%.
This post was last edited by qugd on 2017-1-11 at 13:48. In a mixture of ideal gases, the partial pressure is equal to its partial volume, and also equal to its partial molar amount. In the gas equation, PV = constant, and this constant is directly proportional to the molar amount. It should be noted, however, that the pressure value should be absolute pressure.