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The first accurate atomic clock was built in 1955.
The first accurate atomic clock was built in 1955. This led to the internationally agreed definition of the second being based on atomic time. Under the International System of Units, the second is currently defined as the duration of 9 192 631...
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A set of tutorials, labs, demonstrations, and games on basic chemistry topics.
A set of tutorials, labs, demonstrations, and games on basic chemistry topics. Some example titles: Atomic Numbers Game (how quickly can students determine the atomic mass, atomic number, etc.); Gas Laws Lab (run P vs T, V vs T, and V vs P labs);...
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