How do I set the unit of length in 3D for Unity to cm?

The default for Unity appears to be meters.This is too big for my current project, so is there a way to make it cm?(Weight is Question separately)

One in the reference below is

To change the gravity of the entire game In Edit→Project Settings→Physics, change the Y value of Gravity in PhysicsManager in Inspector from -9.81.

I feel a little uncomfortable with the movement, but I'll wait and see with this!

There is an example like this where I try to do something with gravity, but I would like to make it with something suitable for the one that is purely creating the unit.

My impression of the default unit is the same as the following article.

[Development diary] A story about the fact that the object size on Unity is very large|Sesame-chan Frontier

1m (meter) on Unity corresponds to one side of the default Cube.Since the size of the Cube is all generated by 1 for XYZ, 0.5 is 50cm and 10m is 10m.
Based on that, if you think about the realistic size of my character that I am currently using, the motifs are animal-like such as rabbit and squirrel, so even if you walk on two legs, about 30cm would be a reasonable line.

Hmm... It's the size of the existing dimensions.
Certainly, when I was dealing with Unity standard objects (especially Terrain), I felt that my object was large, but when I think about it in real measure, I have the impression that it is bigger than I thought.It is roughly as tall as a "two-story detached house" in the real world.That's because physical arithmetic is much better.

(I think "mossari" here probably means that you're looking at a big object from a distance and it looks like you're losing weight.)

Summarize the units of sprites in Unity - Shibuya Hotogisu

Unity is in meters

Object malfunction due to not understanding Unity's unit system|patio

Apparently, I was making a coin dropping game using 2 kilograms of coins at 0.7 meters.