Priest,Clergyman,A marriage Registrar etc,anyone who has the authority to conduct marriage but not married himself maybe due to belief or still bachelor

Ice

teapot

COAL

Since it is Given that 1=8 then 8=1

Temperature,Pressure ,Humidity etc .Anything which has its own unit of measurement which does not has distance as one of its property

Pocket Contains AIR.So it is not empty in true sense.

Put the money in front of the mirror

a Glove

No of Vampires in First night                                      1                                                                                                                                          
No of Persons Bitten in first Night                           2

No of Vampires in Second Night                               1+2 =3
No of Persons Bitten in Second Night                    2+4 =6

No of vampires In Third Night                                    1+2+2+4 =9  
No of Persons bitten in Third Night                         2+4+4+6 =16

No of Vampires in Fourth Night                                 1+2+2+4+2+4+4+6=25  
No of Persons bitten in Forth Night                         2+4+4+6+4+6+6+8=40

No of Vampires in Fifth Night                                      1+2+2+4+2+4+4+6+2+4+4+6+4+6+6+8=65
No of  persons bitten in Fifth night is                      2+4+4+6+4+6+6+8+4+6+6+8+6+8+8+10 = 96

So the Number of Vampires in Fifth Night is 65