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This 3-minute Flash video by PBS Zoom demonstrates how temperature affects the density of water. A middle school student demonstrates the concept by placing a one-liter bottle of cold water directly atop a second one-liter bottle of red-colored warm water. Watch the warm red water, which is less dense, rise visibly through the mouth of each bottle to the top of the cold water. The student then performs a second "control" experiment in which both bottles contain cold water (no water movement is observed).

Please note that this resource requires Flash.
Subjects Levels Resource Types
Education Practices
- Technology
= Multimedia
Fluid Mechanics
- Statics of Fluids
= Density and Buoyancy
Thermo & Stat Mech
- Thermal Properties of Matter
= Density
- Middle School
- High School
- Informal Education
- Instructional Material
= Demonstration
= Instructor Guide/Manual
- Audio/Visual
= Movie/Animation
Intended Users Formats Ratings
- Learners
- Educators
- General Publics
- application/flash
- text/html
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© 2008 WGBH Educational Foundation, 2004
Keywords:
NOVA, density video, properties of matter, science videos, simulations, videos
Record Cloner:
Metadata instance created February 15, 2011 by Caroline Hall
Record Updated:
August 19, 2020 by Lyle Barbato
Last Update
when Cataloged:
March 17, 2010
Other Collections:

### AAAS Benchmark Alignments (2008 Version)

#### 4. The Physical Setting

4D. The Structure of Matter
• 6-8: 4D/M3ab. Atoms and molecules are perpetually in motion. Increased temperature means greater average energy of motion, so most substances expand when heated.
• 6-8: 4D/M8. Most substances can exist as a solid, liquid, or gas depending on temperature.
• 6-8: 4D/M10. A substance has characteristic properties such as density, a boiling point, and solubility, all of which are independent of the amount of the substance and can be used to identify it.
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AIP Format
(WGBH Educational Foundation, Boston, 2008), WWW Document, (https://oeta.pbslearningmedia.org/resource/phy03.sci.phys.descwrld.zhot/density-and-buoyancy-mixing-hot-and-cold-water/).
AJP/PRST-PER
PBS LearningMedia: Density and Buoyancy: Mixing Hot and Cold Water (WGBH Educational Foundation, Boston, 2008), <https://oeta.pbslearningmedia.org/resource/phy03.sci.phys.descwrld.zhot/density-and-buoyancy-mixing-hot-and-cold-water/>.
APA Format
PBS LearningMedia: Density and Buoyancy: Mixing Hot and Cold Water. (2010, March 17). Retrieved August 12, 2022, from WGBH Educational Foundation: https://oeta.pbslearningmedia.org/resource/phy03.sci.phys.descwrld.zhot/density-and-buoyancy-mixing-hot-and-cold-water/
Chicago Format
WGBH Educational Foundation. PBS LearningMedia: Density and Buoyancy: Mixing Hot and Cold Water. Boston: WGBH Educational Foundation, March 17, 2010. https://oeta.pbslearningmedia.org/resource/phy03.sci.phys.descwrld.zhot/density-and-buoyancy-mixing-hot-and-cold-water/ (accessed 12 August 2022).
MLA Format
PBS LearningMedia: Density and Buoyancy: Mixing Hot and Cold Water. Boston: WGBH Educational Foundation, 2008. 17 Mar. 2010. 12 Aug. 2022 <https://oeta.pbslearningmedia.org/resource/phy03.sci.phys.descwrld.zhot/density-and-buoyancy-mixing-hot-and-cold-water/>.
BibTeX Export Format
@misc{ Title = {PBS LearningMedia: Density and Buoyancy: Mixing Hot and Cold Water}, Publisher = {WGBH Educational Foundation}, Volume = {2022}, Number = {12 August 2022}, Month = {March 17, 2010}, Year = {2008} }
Refer Export Format

%T PBS LearningMedia: Density and Buoyancy: Mixing Hot and Cold Water %D March 17, 2010 %I WGBH Educational Foundation %C Boston %U https://oeta.pbslearningmedia.org/resource/phy03.sci.phys.descwrld.zhot/density-and-buoyancy-mixing-hot-and-cold-water/ %O application/flash

EndNote Export Format

%0 Electronic Source %D March 17, 2010 %T PBS LearningMedia: Density and Buoyancy: Mixing Hot and Cold Water %I WGBH Educational Foundation %V 2022 %N 12 August 2022 %8 March 17, 2010 %9 application/flash %U https://oeta.pbslearningmedia.org/resource/phy03.sci.phys.descwrld.zhot/density-and-buoyancy-mixing-hot-and-cold-water/

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The AIP Style presented is based on information from the AIP Style Manual.

The APA Style presented is based on information from APA Style.org: Electronic References.

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