When H2O is changed into HHO by electrolysiss in a cell does it create a vacuum or does it pressurize ...???

Question

... the cell ...???

In other words does HHO take up more room than H20..???

How would I test to confirm either way?

Answer 1

Electrolysis changes 2 H2O into 2 H2 + O2. Both H2 and O2 are gasses that are liberated from the liquid water. Since the gasses are less dense than liquid water, the pressure increases.