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ERIC Number: EJ891996
Record Type: Journal
Publication Date: 2007-Apr
Pages: 3
Abstractor: As Provided
Reference Count: 3
ISSN: ISSN-0031-921X
Oscillations in a Linearly Stratified Salt Solution
Heavers, Richard M.
Physics Teacher, v45 n4 p241-243 Apr 2007
Our physics students like to watch a ball bouncing underwater. They do this by dropping a weighted plastic ball into a 1000-ml cylinder filled with a linearly stratified salt-water solution at room temperature. The ball oscillates and comes to rest at about mid-depth. Its motion is analogous to the damped vertical oscillations of a mass hanging from a spring. Our apparatus for producing precise linear salt gradients is simple, inexpensive (cost about $50), and is easy to use. A refractometer is used to measure salt content (or density) of samples taken at various depths. Here we specify fresh- and salt-water volumes for making density gradients suitable for a class demonstration or a three-hour laboratory class.
American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A