Question

do we have to make changes every time in the temperature and pressuer to change the state of a matter

Answer 1

Not necessarily. You can even change the state just by changing the temperature. 
For example, boiling water by raising the temperature till its boiling point or reducing the pressure till such extent that it boils at room temperature.
Please mark me as Brainleist ..

ok ...

Answer 2

Yes,every time we have to make a change in the temperature and pressure to change the state of a matter. Because even at a particular temperature a substance may not change its state if pressure is not enough and vice versa.
Example-
Water boils at 99.6°C at 1ATM(atmospheric pressure) but it can boil at lower temperatures at low pressures (at mountains). Therefore pressure and temperature are the important factors in cahnge in state of matter.
(ÆÑẞWĒRẞ)

#Mãrk åß thē Brāìñlïêßt
Rëgàrdß
Tèám Kâñçhä