perfectly elastc and inelastic

if the elasticity of supply or demand is perfect ineleastic does elasticty equal infinity? what about pefect eleastic does it equal Zero? or id it vice versa or neither of the above.

perfect elasticiy is infinite because Q changes but price doesn’t change…i think?

i found this link => perfect inelasticity is zero because regardless of any changes in price, there will be no changes in quantity… perfect elasticity is infinite b/c price doesn’t change at all…like zizou stated…