Facts by NIST General (5)
Engineering
Dress Sizes The Scientific Way
In pre-industrial America, most clothing was crafted at home or by professional tailors or dressmakers from…
Engineering
How We Use Crystals To Tell Time
Quartz clock operation is based on the piezoelectric property of quartz crystals. If you apply an electric…
Mathematics
Leaps and Bounds
Leap years are years with 366 days, instead of the usual 365. Leap years are necessary because the actual…
Mathematics
Origins Of The Meter
The origins of the meter go back to at least the 18th century. At that time, there were two competing…
Mathematics
Unit Of Luminous Intensity (candela)
Originally, each country had its own, and rather poorly reproducible, unit of luminous intensity; it was…