Relative gravimeters are instruments used to measure small variations in gravitational acceleration at different locations. They work by comparing the gravitational force at a specific point to a reference point, allowing scientists to detect changes in the Earth's gravitational field caused by factors like geological structures or underground voids. These devices are essential in fields such as geophysics, mining, and civil engineering. By providing precise measurements, relative gravimeters help researchers understand subsurface features, monitor resource extraction, and assess the stability of structures. Their ability to detect minute changes makes them valuable tools for both scientific research and practical applications.