Any constant in physics or chemistry comes from experimental design and consistency in measurements. For example, if you divide multiple of pressure and volume with the multiple of moles and temperature, you will get the constant R for any ideal gas.
However, given how small planck’s constant is, how can we assume its accuracy?
In: Physics
It is the most precisely defined value in the universe. It cannot be any value other than it’s exact definition.
But why is it like this? Both a universal constant and perfectly precise at an immeasurable level of detail.
In physics any other values you want to define at this or finer scales become quanta relative to the constant itself. As such definitions of many common units were redefined in 2019 to be based on planck’s constant. It is the fixed value by which the kilogram, joule and many other measurements are defined. The fact that it is a fixed value is built into all math in physical measurements.
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