system
Given the following post, respond as if you're commenting on Reddit:
human
How far can electricity arc reach?

Does electricity's ability to arc depend more on voltage or amperage? Is there a more-or-less-correct formula to calculate how far it could arc in regular room conditions(let's say 21 degrees Celsius and 50% humidity in a regular town urban environment)?

How does conductivity of a material affect the arcing and its distance?
gpt
Primarily the voltage, and roughly speaking you need 30,000 volts per centimetre of air you want to jump. 

The more conductive the air, the lower the voltage required to jump. 

A lightning bolt hitting ground is millions of volts.