What is the typical resistance between two points on a "typical" PCB? Let's say the points are 1mm apart and let's assume a normal office environment.
I've noticed that resistors come in many values, but resistors larger than 10 megaohm are rare or hard to find.
I suppose that a circuit with a 10 gigaohm resistor would be kind of sensitive and probably not a good design (under "normal" circumstances).
Is it somehow understood that resistances more than 10 megaohm would be too affected by electrolytes in the form of grime, pollution and moisture? Or is there some other reason >10 megaohm resistor parts are so rarely used? Noise perhaps?
Edit: It seems my question is partly resting on a false premise. Apparently >10 megaohm resistors aren't that hard to source. I was looking at surface mount thin film resistors at Farnell (www.farnell.com), and those only go to 10 megaohm. But I see now that there are "thick film" resistors above 10 gigaohm.