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Ideal Gas Interactive Animation
I use this animation to instruct on ideal gases in chem and physics. Topics of partial pressure, absolute zero, mass dependent velocity, boyle,charles, avagadro, etc are good topics. Also stress the flaws which include the point masses have volume.
When you are making a measurement there are always a certain number of known or certain digits. The known or certain digits plus the first unknown Digit is referred to as the SIGNIFICANT FIGURES.