http://www.ck12.org Chapter 3. Measurement
- Complete the following calculation and report the answer with the correct number of significant figures:
(1.68)(7.874)(1.0000/55.85). - Solve the following equation for n and report the answer with the correct number of significant figures:
(11.2/760.0)(123.4) = n(0.0821)(298.3)
Further Reading / Supplemental Links
- Robinson, A. (2007). The Story of Measurement. New York: Thames and Hudson.
- Mass of snowflake approximation: http://hypertextbook.com/facts/2001/JudyMoy.shtml
- Uncertainty of Volumetric Glassware: http://www.wellesley.edu/Chemistry/Chem105manual/Appendices/unce
rtainty_volumetric.html - Online Temperature Converter: http://www.onlineconversion.com/temperature.htm
- Lide, D. R. (Ed.). (1992-1993). CRC Handbook of Chemistry and Physics (73rd ed.). Boca Raton, Florida:
CRC Press, Inc.
Points to Consider
- Compare and contrast the differences between a number and a measurement? What would be an example of a
number and an example of a measurement? - One way to remember the formula for density, as well as how to rearrange variables within the density equation
is with the following formula triangle - In this lesson we have seen that all measurements have an associated uncertainty. Yet, this does not imply
there are flaws in the process of measurement. How might you explain to someone the concept of uncertainty,
and how reconciling uncertainty in measurement actually makes the estimate more trustworthy, not less?