Write the difference between $G$ and $g$.

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(N/A) $G$ is the Universal Gravitational Constant,while $g$ is the acceleration due to gravity.
$1$. $G$ is a constant value throughout the universe $(G = 6.67 \times 10^{-11} \ N \ m^2/kg^2)$,whereas $g$ varies from place to place on the Earth and other celestial bodies.
$2$. $G$ is a scalar quantity,while $g$ is a vector quantity.
$3$. The $SI$ unit of $G$ is $N \ m^2/kg^2$,whereas the $SI$ unit of $g$ is $m/s^2$.

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