Mean free length

Atmospheric temperature

Number of ions

Size and charge per ion

increased inductance

increased reactance

increased power loss

all of the above

humid weather

dry weather

winter

hot summer

much less than that needed in fair weather

much higher than that needed in fair weather

equal to that needed in fair weather

none of the above

produces a pleasing luminous glow

makes line current sinusoidal

works as a safety valve for surges

ozone gas is produced