MG11 
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The Newtonian gravitational constant: modern status and perspective of a new determination

The Newtonian gravitational constant G together with Planck's constant h and the speed of light c are the fundamental constants of nature which represent the fundamental limits: c is the maximal speed, h is the minimal angular momentum and G is the gravitational radius of unit mass (the maximal radius of the sphere for relativistic gravitational collapse). Due to the weakness of gravity the accuracy of G is essentially below the accuracy of other fundamental constants. New measurements on the accuracy level of 10-30 ppm are rather desirable. The history and current status of the experiments for the determination of the gravity constant are reviewed. The new experiment for the G measurement, which is carried out in the framework of collaboration of Russia and China on the pointed accuracy level, is presented. This work are supported by the Russian Foundation for Basic Research (Grant No 05-02-39014) and the National Basic Research Program of China.