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1. Introduction; 2. Basic description of some physical properties of dilute monoatomic gases; 2.1. Thermophysical and transport properties; 2.2. Electrical properties; 3. Basic theory and operation of acoustic and microwave resonators; 3.1. Acoustic and microwave frequencies in a spherical cavity; 3.2. Effects of perturbed geometry on achievable precision and accuracy; 4. Speed of sound as a thermodynamic temperature standard; 4.1. Relationship between speed of sound and thermodynamic temperature; 4.2. Physical meaning of the Boltzmann constant and primary acoustic thermometry; 4.3. Review of recent results obtained by primary acoustic thermometry; 4.4. Redetermination of the molar gas constant R and the Boltzmann constant k; 5. Speed of light for an atomic pressure standard; 5.1. Working equations for an electric primary pressure standard; 5.2. Current precision and accuracy achievable with a primary pressure standard
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