Question

How could you tell whether a liquid is
honey or vinegar?

Answer 1

I really don't recommend identifying substances by taste, but honey is sweet,

while vinegar is sour. A safer way would be to see if one is more viscous

than the other. Viscosity is the ability to pour a fluid. This is a topic in fluid

dynamics. Hydrodynamics and aerodynamics are sub-specialties.

Answer 2

Based on the liquids viscosity (which is a measure of how quickly/slowly a fluid can flow).

Higher viscosity represents a "thicker" liquid & slower flow (honey)
Lower viscosity represents a "thinner" liquid & quicker flow (vinegar)