| 摘要 |
PURPOSE:To know the density of gas with good accuracy by deciding the difference between the apparent mass when a vessel contg. a sample fluid under optional temp. and pressure is suspended in water kept at 4 deg.C and the mass of a vaccum vessel when the same is suspended in water kept at 4 deg.C as the mass of the sample fluid in the vessel. CONSTITUTION:A vessel 3 attached with a float 2 to the arm 1 of a balance is suspended in water kept at 4 deg.C. The float 2 is a hollow object, and is designed to receive suitable buoyance according to the mass and volume thereof. When a vaccum vessel floats owing to the buoyancy of the water and part thereof emerges to the outside of the water, the entire part thereof can be submerged into the water by attaching the weight 4 of the same material as the material of the vessel. The measurement of the density of the sample fluid by this method is accomplished by the following operation: The vessel is first evacuated. The vacuum vessel is suspended in the water kept at 4 deg.C, and weighed, whereby the apparent mass M0 is obtd. The vessel is filled with the sample fluid at temp. t deg.C and pressure (p). The sample contg. the sample fluid is suspended in the water kept at 4 deg.C and is weighed, whereby the apparent mass M is obtd. The mass (m) of the sample fluid in the vessel is m=M-M0. The density rho of the sample fluid at t deg.C and (p) is rho=m/V where the volume of the vessel at t deg.C and (p) is designated as V. |
