DEFINITION OF GRAVIMETER

A gravimeter is an instrument that measures

and determines the specific gravity of a substance or measures

variations in the gravitational field of the Earth. Common

gravimeters often are made with a simple mass-spring

assembly. By hanging a mass on the spring we can account

for how much gravity is affecting the mass by how far the

spring has stretched. Simple gravimeters are easy to operate

but lack the precision needed to view the minute changes in

the gravitational field of the Earth. Modern gravimeters are

much more accurate and are employed in the field to study

the gravitational field of the Earth but are much more complicated

and employ special springs known as “zero springs.”

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