what is the unit of pressure ?

Pascal

what is the unit of force?

Newton

types of mirrors

Types of Mirrors : 

1- plane

2- concave

3- convex

energies in molecule

Energies in Molecule :

1- electronical

2- vibrational 

3- rotational

types of motion

Types of Motion :

1- translational

2- rotational 

3- complex

states matter

States of Matter :

1- solid

2- liquid

3- gas

4- plasma

And there are fifth state called ( BECS ) 

Bose Einstien Condensate State

momentum

Momentum :

is defined as product of mass with velocity .