Can you guess which one is determined by a particular physical object

Can you guess which one is determined by a particular physical object

1 Reading the definitions of units at https://physics.nist.gov/cuu/Units/current.html can you guess which one is determined by a particular physical object? Explain reasoning for your guess.

(In case the nist.gov site is unavailable please use: https://www.mathsisfun.com/measure/index.html and read about metric and standard systems)

2 Then watch https://www.youtube.com/watch?v=ZMByI4s-D-Y to find which unit out the seven base units is in fact determined by a single object in the universe? Did you make a good guess?

3 Discuss why in the video for the round object they picked a sphere and not some other shape, any practical reasons?

4 Watch: https://www.youtube.com/watch?v=PXiyqWnixqo and then https://www.youtube.com/watch?v=SsULOvIWSUo .Give examples from the videos for practical reasons to have accurate measure of time over the centuries

Answer preview Can you guess which one is determined by a particular physical object

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