1. Speed of light (c) = 2.9979
� 108 ms-1 (metres per
second) 2. Avogadro�s number (N) = 6.022
� 102 3
mol-2 (per mole)
3. Mass of an electron (me) = 9.1095
� 10-
31 Kg
4. Mass of a proton (mp) = 1.6726
� 10-27
Kg
5. Mass of a neutron (mn) = 1.6748
� 10-27
Kg
6. Gas constant (R) = 8.3144 JK-1 mol-1 (joules
per kelvin per mol)
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