Saturday, June 25, 2011

Serial Dilutions II

***UPDATE- View the updated illustration at

Serial dilutions are a common part of may laboratory procedures. Background on serial dilutions, how they are performed and calculation of dilution factors are covered in a previous post.

The following illustration extends the exploration of serial dilution by following changes in the volume and concentration of a solution over three dilution steps.

Friday, June 10, 2011

Pendulum Period

Clocks with quartz movements are more accurate at keeping time than those that use pendulums. Quartz has largely replaced pendulums in modern clocks. But, in their day, pendulum clocks were profoundly important due to their ability to measure time accurately over long periods. The first pendulum clocks were produced in the mid 17th century and their impact was dramatic. Their use ushered in a new era of accurate time keeping. The reliability of pendulum clocks is based on the predictable relationship between the length of a pendulum and the time it takes the pendulum to complete one full swing.
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