State the reason why water gets filled in the dropper when we press the bulb of a dropper before placing its nozle in water...​

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later

Not a  mixture of two common elements that can be separated by physical means.

The answer is conduction