# Why is the value of g is different in polar, equinoctial and the tropical regions?

## Why is the value of g is different in polar, equinoctial, and tropical regions?

As the earth is not perfectly round, the polar regions are a bit compressed,
therefore the radius of the Earth R is not constant. Hence the value of g is
not the same at all places on earth. The value of g is different in different
places on earth. The value of g is highest in the polar region and it is
9.83217 ms^{-2}. In the equinoctial region, it is 9.78039
ms^{-2} and in the tropical region, it is 9.78918
ms^{-2}. Its value at sea level altitude of 45 degrees is accepted as
the standard value. The standard value of g is 9.80665 ms^{-2}. For
convenience, the standard value of g is taken to be 9.8
ms^{-2} or 9.81 ms^{-2}.

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