Measuring length and time with light

International Year of Light Blog

In everyday life aspects we face the need to know the value of the different features of the objects we use, acquire, eat, etc., like checking the time, our body weight, the vehicle fuel level, our home electricity consumption, and many other physical, chemical and biological quantities. This need we have to quantitatively know our world is addressed by the metrology, the scientific discipline devoted to measurements; a measurement being a comparison of a given property against a known reference of the same nature, commonly known as “measurement standard”.

The seven SI base units and their links to fundamental physical constants. Credits: http://www.bipm.org/en/si/si_constants.html The seven SI base units and their links to fundamental physical constants. Credits: http://www.bipm.org/en/si/si_constants.html

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