Int J Thermophys (2012) 33:6–21 DOI 10.1007/s10765-011-1120-x Burnett Method with Absolute Pressure Transducer and Measurements for PVT Properties of Nitrogen and Hydrogen up to 473 K and 100 MPa N. Sakoda · K. Shindo · K. Motomura · K. Shinzato · M. Kohno · Y. Takata · M. Fujii Received: 16 January 2011 / Accepted: 28 October 2011 / Published online: 10 November 2011 © Springer Science+Business Media, LLC 2011 Abstract A measurement method for PVT properties of high-temperature and high- pressure gases was developed by simplifying the Burnett method and revising the data acquisition procedure. Instead of a differential pressure transducer, which is tradi- tionally used, an absolute pressure transducer is used in the present method, and the measurement of pressure becomes easier. However, the absolute pressure transducer is placed outside the constant temperature bath because of the difficulty of its use in high-temperature surroundings, and some parts with different temperatures from the sample vessels exist as dead space. The present method takes into account the effect of the dead space in the data acquisition procedure. Nitrogen was measured in the temperature range from 353 K to 473 K and at pressures up to 100 MPa to determine the apparatus constants, and then, hydrogen was measured at 473 K and up to 100 MPa. The determined densities are in agreement within uncertainties of 0.07 % to 0.24 % (k = 2), both with the latest equation of state and existing measured data. Keywords Burnett method · High pressure · High temperature · PVT properties N. Sakoda (B ) International Research Center for Hydrogen Energy, Kyushu University, Fukuoka, Japan e-mail: sakoda@mech.kyushu-u.ac.jp K. Shindo · K. Motomura · M. Kohno · Y. Takata Department of Mechanical Engineering, Kyushu University, Fukuoka, Japan K. Shinzato · M. Fujii Research Center for Hydrogen Industrial Use and Storage (HYDROGENIUS), National Institute of Advanced Industrial Science and Technology (AIST), Fukuoka, Japan M. Kohno · Y. Takata International Institute for Carbon-Neutral Energy Research (I 2 CNER), Kyushu University, Fukuoka, Japan 123