Ghosts

 

i) A ghost in the Harry Potter world is similar to the ghost we see in movies, it's a three-dimensional imprint of a wizard or witch who passed away. 

ii) Not all wizards and witches become ghosts, the ones who have unfinished business, sometimes in the form of regret, guilt, fear or overt attachment to the material world who refuse to move on to the next dimension.

iii) Ghosts can pass through solid objects without causing damage to themselves or the material. But they can make disturbances in water, fire and air. 

iv)Their appearance can also turn flames blue.

v) When ghosts pass through a living creature, the creature will experience a freezing sensation.

vi) It’s said that muggles can’t turn into ghosts.

vii) Witches and wizards can see and hear ghosts while a Muggle can only feel that a haunted place is creepy.

viii) When a muggle says that he or she has seen a ghost in a perfect focus they are probably lying or they are just witches or wizards showing off.