What is the unit of "velocity" in “Emitters”? Is it scale dependent?

[Aoko-Tao]

Hello, thanks very much for sharing this excellent simulator! I have some questions:

1. Does the simulator use the International System of Units? For example, does a velocity of 1 mean 1 m/s? Are the units of "emitStartTime" and "emitEndTime" in seconds?
2. I noticed that in discussion Units for viscosity? #170, you mentioned the viscosity parameter is scale dependent. Are there any other parameters that are also affected by the scale?
3. Here is a specific example: When I set the "velocity" of the "Emitter" to 1, does it mean the initial velocity of the emitted particles is 1 m/s? Will the velocity of the particles vary due to differences in the particleRadius, the width of the Emitter, or the scale of rigidbodies in the scene?
   Thanks in advance.