Fill in the blanks.

a) Temperature does not change while a solid substance is …….. or a liquid substance is…….

b) A vapour on cooling changes into …….and on further cooling changes into……..

c) Matter changes from one state to another either raising the ………… or lowering the …………

d) A change in which a solid on heating directly changes into vapour state is called …………

e) The inter particle spaces are ………… in gaseous and ………… in solids.

(a) Melting, boiling

At melting and boiling temperature substance absorbs heat to change its phase.

(b) Liquid, Solid

As Vapor loses heat it converts into liquid, on further cooling its temperature decreases and it will convert into solid.

(c) Temperature, Pressure

Water boils when its surrounding pressure is equal to its vapor pressure. If I keep temperature constant and change its pressure so that it’s surrounding pressure equals to the vapor pressure. It will boil.

(d) Sublimation

(e) Highest, Lowest