system
Given the following post, respond as if you're commenting on Reddit:
human
If Planck length is the smallest length possible, then isn't the smallest volume possible 1 cubic Planck length? Does this mean that the universe is made of tiny cubes?
gpt
Contrary to what you often read or hear, the Planck length is not the smallest length possible.

The Planck length is part of a system of units called Planck units or natural units. In this system, a number of commonly used constants of nature are set to 1, for ease of calculations (the constants drop out of equations when they're rescaled to Planck units, making equations easier to read and manipulate).

In the system of Planck units, the base unit for length is the Planck length, just like the meter is the base unit for length in the SI (Système International, the default set of units we all know and love (except Americans)).

The Planck length is, in some theories in physics, close in value (within a factor 10) to notions such as the shortest measurable length, but there is no indication that space is discretized in Planck-length-sized blocks.