भौतिक नियतांक किसे कहते हैं?

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► इलेक्ट्रॉन का द्रव्यमान m = 9.1 ×10-31 किग्रा. ► निर्वात की विद्युतशीलता ε0 = 8.85 × 10-12 कूलाम2/न्यूटन-मीटर2 ► प्रोटोन का द्रव्यमान mp = 1.67 × 10-27 किग्रा. ► फैराडे नियतांक F = 9.6 × 104 कूलाम/मोल ► रिडबर्ग नियतांक R = 1.097 × 107 मोल-1 ► बोर त्रिज्या = 5.29 × 10-11 मीटर

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► निर्वात की चुंबक शीलता µ0 = 4π × 10-7 न्यूटन/एम्पियर2 ► α-कण का आवेश = 3.2 × 10-19 कूलाम ► α-कण का द्रव्यमान = 6.6 × 10-27 किग्रा. ► प्रोटोन का द्रव्यमान = 1.00278 amu ► न्यूट्रॉन का द्रव्यमान = 1.00867 amu ► इलेक्ट्रॉन का द्रव्यमान = 0.00055 amu ► 1 amu = 93 मेगा इलेक्ट्रॉन वोल्ट (MeV) ► 1 u = 1.77 × 10-27 किग्रा.

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► N.T.P. पर वायु का घनत्व = 1.29 × 103 किग्रा./मीटर3 ► जल का घनत्व = 1.00 × 103 किग्रा./मीटर3 ► पारे का घनत्व = 13.6 × 103 किग्रा./मीटर3 ► गुरुत्वीय त्वरण g = 9.8 मीटर/सेकण्ड2 ► पृथ्वी का द्रव्यमान Me = 5.98 किग्रा. ► पृथ्वी की त्रिज्या Re = 6.37 × 106 मीटर या 6400 किमी. ► बर्फ की गुप्त ऊष्मा = 80 कैलोरी/ग्राम या 3.34 × 105 जूल/किग्रा.

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