[MAS.865](../index.html) > [Metrology](index.html)
## Metrology
how to assign numbers to almost anything
###[General concepts](general.html)
### Physical quantities
* [Electric field](efield.html)
* [Time](time.html)
* [Magnetic field](bfield.html)
* [Position, Distance and Angle](position.html)
* [Force and Pressure](force.html)
* [Acceleration and Vibration](acceleration.html)
* [Sound](sound.html)
* [Light and Image](image.html)
* [Temperature](temperature.html)
### links
* [Fab class Input devices](http://academy.cba.mit.edu/classes/input_devices/index.html)
* [2.131: Advanced Instrumentation and Measurement](http://meche.mit.edu/featured-classes/advanced-instrumentation-and-measurement)
* [robrenz](https://www.youtube.com/user/ROBRENZ/videos)
* [oxtoolco](https://www.youtube.com/channel/UCZC9LGZLfyjrKT4OZne-JNw)