Remember when Stan stated that voltage is a physical force in the circuit? Here's an example under a microscope.
4kV applied to a 1/8" wide x 3/16" height x 1" length column water (both tap and distilled are tested). Electrodes are 3/16" square rod 304 Stainless steel. Power supply is an EMCO F40.
In this test you can clearly see that when using distilled water there is a greater effect (physical force) on the gas bubbles. We know with distilled water the electric field strength is much higher since the lower conductivity (higher resistivity) prevents the current from bleeding off the charge. This test demonstrates that voltage provides a physical force in a circuit, and that current limiting allows the force to be dominant.
Measured resistivity of the water gap:
Distilled Water-11,800 Ohms
Tap Water-650 Ohms
In reality the voltage is much lower than the 4kV the PS outputs because of the low resistivity of both distilled and tap water.
With distilled water measured peak voltage was around 120V while tap water measured peak voltage was around 11V.
More to come...