Page 34 - prim 5 booklet 2025 modified
P. 34
Delta Modern Language Schools
Science department
Grade 5
1st term 2024 -2025
• In melting process:
The particles of a They move Their Matter
liquid matter release slower temperature changes
to solid
thermal energy decreases
• In freezing process:
The particles of a They move Their Matter
solid matter gain around temperature changes to
thermal energy more
increases liquid
Evaporation process Condensation process
The particles of a liquid matter When water vapor touches a cold surface,
gain heat energy and they move the thermal energy of the water vapor is
transferred to the cold surface so the
around more and their particles move slower and get close
temperature increases so the
together that causes the change of the water
matter changes to gas vapor from gas state to liquid state
• Notes:-
➢ 0◦C is known as the freezing point of water.
➢ ◦C is the measuring unit of temperature.
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