Sweet argon music helps redefine temperature

• Autores: Jacob Aron
• Localización: New scientist, ISSN 0262-4079, Nº. 2925, 2013, pág. 10
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • The International Committee for Weights and Measures in Paris, France, suggests defining the kelvin in terms of the Boltzmann constant, which relates the energy of particles to their temperature. That would be accurate even at extremes. The tricky part is setting an accurate value for the constant. Michael de Podesta and his colleagues filled a copper vessel with a known volume of argon gas. A gas' energy is related to the average speed of its atoms, which is linked to the speed of sound. By playing notes through the vessel at many frequencies, the team determined the speed of sound in the argon, and the energy of its atoms.