First direct determination of the Boltzmann constant by an optical method

following: (i) control and accurate measurement in real time of the gas temperature, by placing the absorption cell in a thermostat, and (ii) a precise record and reliable model of

The determinations of α are obtained in different domains of physics, from the quantum Hall effect and Josephson effect in solid state physics, from the combination between the

Introduction: Early ultrasound fetal sex determination is of obvious interest, particularly in the context of X-linked diseases. This difference is apparent from

The theoretical resonance curve R (9) is calculated with the hypothesis of a perfec- tly parallel and monochromatic light beam, whereas the real experimental beam has finite

<: ™Pi£y : measurements were carried out using an ellipsometer without compensator,following the ideas and procedures outlined pre- viously (1). In the region tf u) > Eg

(4) This expression is the basis of the present determination of the Boltzmann constant, deduced from the measurement of the frequencies of the acoustic resonances, extrapolated to

Figure 5 presents the gas temperature variations and the inner pressure changes during the second isotherm.. 4 8 12 16 20 24

23 Left Average values of the flow dependence on the resonance frequency measurements, as mea- sured in argon using the (0, 3) mode of BCU3 at four static pressures.. Dots