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Related Experiment Videos

A new determination of G using two methods.

T J Quinn1, C C Speake, S J Richman

  • 1Bureau International des Poids et Mesures, Pavillon de Breteuil, F-92312 Sèvres Cedex, France. tquinn@bipm.org

Physical Review Letters
|September 5, 2001
PubMed
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This study precisely measured the gravitational constant (G) using a torsion-strip balance in two independent methods. The experiment yielded a new value for G, consistent with previous findings but slightly higher than a recent measurement.

Area of Science:

  • Physics
  • Metrology
  • Gravitation

Background:

  • Accurate measurement of the gravitational constant (G) is crucial for fundamental physics and geophysics.
  • Previous measurements of G have exhibited significant discrepancies, highlighting the need for independent verification.
  • Torsion balance experiments are a primary method for determining G due to their sensitivity to weak forces.

Purpose of the Study:

  • To present a new, precise measurement of the gravitational constant (G).
  • To validate the measurement using two substantially independent experimental configurations of a torsion-strip balance.
  • To compare the obtained value of G with recent experimental results.

Main Methods:

  • Utilized a torsion-strip balance for measuring the gravitational force between masses.

Related Experiment Videos

  • Employed two distinct and independent experimental setups with the torsion-strip balance.
  • Analyzed data to determine the value of G and its associated uncertainty.

    • Main Results:

    • The gravitational constant G was measured as 6.675 59(27)x10^-11 m^3 kg^-1 s^-2.
    • The result has a standard uncertainty of 4.1 parts in 10^5.
    • The two independent methods yielded consistent results, with a correlation coefficient of -0.18.
    • The measured G is approximately 2 parts in 10^4 higher than a recent result by Gundlach and Merkowitz.

    Conclusions:

    • The study provides a new, high-precision value for the gravitational constant G.
    • The consistency between the two independent methods strengthens the reliability of the result.
    • The slight deviation from a recent measurement warrants further investigation into potential systematic effects in G determinations.