| 摘要 |
Density indicating apparatus comprises a guide member, a fixed magnet at one end of the guide member, a movable magnet movable up and down the guide member and a detector for detecting changes in position of the movable magnet. The two magnets are arranged one above the other so as to repel each other so that when immersed in a fluid, the second magnet takes up a position dependent on its weight, the magnetic forces acting on it and the buoyancy force due to displaced fluid.
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