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A special reference densimeter has been developed for accurate measurements of densities of natural gases and multicomponent gas mixtures at standard conditions of temperature and pressure (Ts = 273.15 K and ps = 0.101325 MPa). The densimeter covers the range from 0.7 kg · m−3 to 1.3 kg · m−3; the total measurement uncertainty in density is 0.020 % (95 % level of confidence). The measurement principle...
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