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CAIE IGCSE Physics Latent Heat and Evaporation

Practise heating and cooling curves, latent heat, particle explanations and the differences between boiling, evaporation, condensation and solidification.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • interpret constant-temperature sections of heating curves as melting or boiling
  • explain state changes through energy transferred and forces between particles
  • distinguish surface evaporation from boiling throughout a liquid and explain cooling

Covered syllabus points

2.2.3.1—Melting and boiling in terms of energy2.2.3.2—Melting and boiling temperatures for2.2.3.3—Condensation and solidification in2.2.3.4—Evaporation in terms of the escape of2.2.3.5—Evaporation causes cooling of a liquid2.2.3.6—Differences between boiling and2.2.3.7—Temperature, surface area and air2.2.3.8—Cooling of an object in contact with

2.2.3 Melting, boiling and evaporation question 1

[Maximum number: 1]

A pure substance is heated slowly. The temperature of the substance is measured as it starts to melt and when it finishes melting.

Which statement is correct?

A

The temperature decreases slightly as the substance melts.

B

The temperature fluctuates as the substance melts.

C

The temperature increases as the substance melts.

D

The temperature stays the same as the substance melts.

2.2.3 Melting, boiling and evaporation question 2

[Maximum number: 1]

Which points are the fixed points of the liquid-in-glass thermometer shown?

Figure for Question 2.2.3 Melting, boiling and evaporation question 2 — CAIE IGCSE Physics
A

the beginning and end points of the column of liquid

B

the points marked −10∘C-10^{\circ} \mathrm{C} and 110∘C110^{\circ} \mathrm{C}

C

the points marked 0∘C0^{\circ} \mathrm{C} and 100∘C100^{\circ} \mathrm{C}

D

the top and bottom points of the thermometer bulb

2.2.3 Melting, boiling and evaporation question 3

[Maximum number: 3]

Fig. 2.1 shows an electric tumble dryer used to dry wet clothes.

Fig. 2.1

Fig. 2.1

Question (a)

(a)

Hot air blows into the drum. The air gains water vapour from the clothes and then leaves the drum. The moist air enters the condenser. Cool air leaves the condenser, passes through the heating element and enters the drum again.

[ 3 ]

Question (i)

(i)

State the process by which the hot air removes water from the wet clothes.

[ 1 ]

Question (ii)

(ii)

The air is cooled as it passes through the condenser.

Describe and explain one other way in which the air leaving the condenser is different from the air entering the condenser.
description
explanation

[ 2 ]
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