Page 33 - prim 5 booklet 2025 modified
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Delta Modern Language Schools Unit 2 concept 3
Science department
Grade 5
1st term 2024 -2025
Comparing changes in matter
Melting : It is a process in which a matter is changed from solid to liquid state by heating.
➢ Matter can be changed from one state to another without any change in:
its amount ( Mass)
number of particles of the matter
➢ We use thermal energy every day in:
cooking food
warming homes
Sun keeps living things on the Earth alive
• Any matter is made up of very small particles.
• Particles in matter are always in motion state.
• When particles of a matter absorb more thermal energy they move, vibrate and spin
around faster that causes this matter to become warmer.
• Light energy is like thermal energy when particles of a matter absorb them, particles
move, vibrate and spin faster.
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