ผลต่างระหว่างรุ่นของ "ไฮโดรมิเตอร์"

[[File:Hydrometer6455.png|thumb|upright|Hydrometer from Practical Physics]]

[[File:Aerometer.svg|thumb|upright|Schematic drawing of a hydrometer. The lower the density of the fluid, the deeper the weighted float B will sink; the depth can be read off the scale A.]]