164,787,966 Videos Watched

Age Filter: Click to Set

Embed Video
Embed Video:
URL of source video:
Simply give the URL and we will get the embed code automatically, if we support embedding from the site.


There are 6 videos in this category and 0 videos in 0 subcategories.

Category Videos
Not Right For WatchKnowLearn
Ages: 16 - 18
Vapor Pressure and Concentration
From YouTube, produced by The North Carolina School of Science and Mathematics
Part of NCSSM CORE collection: This video shows the transfer of water from a solution of low concentration to a solution of high concentration. (01:29)
December 14, 2011 at 10:56 AM
  • Favorites

Not Right For WatchKnowLearn
Ages: 14 - 18
The Mole
From learner.org, produced by University of Maryland
Using Avogadro's law, the mass of a substance can be related to the number of particles contained in that mass. Chemists have learned how to count molecules by weighing macroscopic amounts. Chemists must measure precise amounts for reactions to occur... [more]
Found by laneyk in Mass
March 25, 2010 at 11:23 PM
  • Favorites

Not Right For WatchKnowLearn
Ages: 14 - 18
Center of Mass - Khan Academy
From YouTube, produced by Salman Khan
Introduction to the center of mass. This video, which is suitable for high school students, starts with a black screen because the instructor, in his conversational tone, uses it as a 'chalkboard.' Instructor uses different colors for clarification. ... [more]
Found by teresahopson in Mass
August 14, 2009 at 04:46 PM
  • Favorites

Not Right For WatchKnowLearn
Ages: 13 - 18
Conservation of Mass
From teachingchannel.org, produced by The Teaching Channel
Lesson Objective: Student chemists prove conservation of mass with 3 quick labs.  Questions to Consider: How do the 3 short labs help solidify conservation of mass for students?Notice how Mr. Forrest concludes each lab by summarizing results and posi... [more]
Found by Mrs Jefferies in Mass
January 20, 2012 at 12:03 AM
  • Favorites

Not Right For WatchKnowLearn
Ages: 15 - 18
What is Molar Mass?
From YouTube, produced by drarianevinson
In this nine-minute video clip, the viewer will learn how and why we talk about element masses in terms of grams per mole instead of atomic mass units. (09:07)
Found by teresahopson in Mass
December 11, 2011 at 03:08 PM
  • Favorites

Not Right For WatchKnowLearn
Ages: 10 - 18
Mass - Sixty Symbols
From YouTube, produced by Sixty Symbols
What is mass and where does it come from? Video explains mass, inertia mass of an object, and what causes mass.  There are many things about mass which we don’t know.  Mass has two definitions, one is gravity, the more massive an object is the more m... [more]
Found by Barb in Mass
August 13, 2009 at 06:04 AM
  • Favorites
History [show]

Loading history...

Please make your comments on categories positive, and not just negative.

People work hard on educational categories, and we want to encourage them to make more!

  • Profanity (curse words), sexually suggestive remarks, and other such obviously inappropriate comments will be deleted immediately, and are grounds for immediate expulsion. Remember, children use this website.
  • Personal criticism on project forums and in video content is not allowed and will be deleted immediately. Any violations of this rule could result in expulsion from the project so please, no insults or other negative personal remarks.
  • Very harshly-worded criticism of content will also be deleted promptly. Please use your vote to express your harshest feelings. Repeated violations of this rule can result in expulsion. If you must criticize another person's hard work, then be nice about it.
If you want to comment, please sign in