Question

Matter changes from one state to another state on changing in ______.
(A)- Density
(B)- Pressure
(C)- Temperature
(D)- All

Answer 1

Changes of matter i.e. solid, liquid & gas, etc. from one form to another form takes place only when due to some reason there is certain changes in the internal energy and arrangement of atoms inside the matter.

Complete step by step solution: Whenever there is change in pressure & temperature, changes in matter takes place.
-As pressure on any substance increases or decreases then molecules come closer to each other or go away from each other respectively, and as a result state of matter changes.
Example: When pressure increases on gas it converts into liquid or when pressure decreases on liquid it converts into gaseous state.
-As temperature on any substance increases or decreases then molecules go away from each other or come closer to each other respectively, and as a result state of matter changes.
Example: When temperature of water decreases then it converts into ice because molecules come close to each other i.e. matter changes from liquid to ice.

Hence, option (B) & option (C) is correct.

Note: Here some of you may get confused in the option (A) why it is not present in the changing factor, so the reason is that density changes when the state of matter changes from one form to another form. It is not responsible for changing the matter.