Volume Rongga Dalam Satu Unit Sel 3 Jenis Kubus
Kubus Sederhana
r = jari-jari atom
a = 2 r^3
volume kubus
= a^3
= (2 r )^3
= 8 r^3
volume atom
= 4/3 . 3,14 . r^3
= 4,19 r^3
volume rongga
= 8 r^3 – 4,19 r^3
= 3,81 r^3
% rongga
= (3,81 r^3 : 8 r ^3) x 100%
= 47,66 %
Kubus Berpusat Badan
(4 r)^2 = 3 a^2
a^3 = 12,31 r^3
volume rongga = volume kubus - volume atom
= a^3 - 2 . (4/3 . 3,14 . r^3)
= 12,31 r^3 - 8,37 r^3
= 3,94 r^3
% rongga = (3,94 r^3 : 12,31 r^3) x 100%
= 32,01 %
Kubus Pusat Muka
(4 r)^2 = 2 a^2
volume rongga = volume kubus - volume atom
= a^3 - 4 (4/3 . 3,14 . r^3)
= 22,63 r^3 - 16,75 r^3
= 5,88 r^3
% rongga = (5,88 r^3 : 22,63 r^3) x 100%
= 25,97 %
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