✔ 最佳答案
Gravity is measured using gravimeters. There are two basic kinds of gravimeters. Absolute gravimeters, which nowadays can also be used in the field, are based directly on measuring the acceleration of free fall (for example, of a reflecting prism in a vacuum tube). They are used for establishing the vertical geospatial control. Most common relative gravimeters are spring based. They are used in gravity surveys over large areas for establishing the figure of the geoid over these areas. Most accurate relative gravimeters are superconducting gravimeters, and these are sensitive to one thousandth of one billionth of the Earth surface gravity. Twenty-some superconducting gravimeters are used worldwide for studying Earth tides, rotation, interior, and ocean and atmospheric loading, as well as for verifying the Newtonian constant of gravitation.
2007-01-09 08:25:40 補充:
「太空船」有裝的正確名稱是陀螺儀(Gyroscope),其實是加速計的一種。在物理學內,加速相等於重力。簡單來說原理是靠慣性,開始轉動後,其轉動軸會一直維持同一方向。