Alexander, W. Nathan Department of Aerospace and Ocean Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia.
Show previous versions
- Units of measurement
- Principle of operation
- Types of constant-mass hydrometers
- Float-type hydrometer
- Needle-type hydrometer
- Ball-type hydrometer
- Links to Primary Literature
- Additional Readings
An instrument used to measure the density of a liquid. Often, the measurement is given in reference to the density of another liquid, typically water, as specific gravity, SG = ρsample/ρref, where ρsample and ρref are the densities of the sample and the reference liquid, respectively, but other units are common as well. For instance, degrees Baumé, API, or Brix, and alcohol proof are all units of measurement found on hydrometer scales, each of which ultimately relates to the density of the solution for defined applications. These density relations are specific to a reference solution temperature and a sample solution temperature defined by the manufacturer. Corrections may need to be applied for measurements at other liquid temperatures. See also: Density
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Its dedicated editorial team is led by Sagan Award winner John Rennie. Contributors include more than 9000 highly qualified scientists and 42 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 17,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information