# How are units of measure defined in Quantum Mechanics?

1. Jan 21, 2015

### Stephen Tashi

In classical physics, the definition of a unit of measure involves a deterministic process (e.g. "the amount of force necessary to give a kilogram mass the acceleration of 1 meter per second square"). How are such units defined in Quantum Mechanics?

( Do we replace references to quantities with references to their expected values? )

2. Jan 21, 2015