| Budget Amount *help |
¥24,310,000 (Direct Cost: ¥18,700,000、Indirect Cost: ¥5,610,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥11,440,000 (Direct Cost: ¥8,800,000、Indirect Cost: ¥2,640,000)
Fiscal Year 2014: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
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| Outline of Final Research Achievements |
The universal gas constant is determined by acoustic measurements of gases, however, other independent methods were not successful. On the other hand, recently, density measurement uncertainty has been reduced. In the present study, a new method for the determination of the gas constant was developed. A 1-kg silicon single crystal sphere and tantalum disks were prepared. By measuring the buoyancy force different, helium gas density can be obtained. From the measurement results for the temperature and the pressure with thus obtained gas density, it is shown that the gas constant can be determined with a relative uncertainty of several ppm.
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