Q1
The process of ice turning into water is called:
Amelting
Bfreezing
Cevaporation
Dcondensation
CBSEClass 6 (CBSE)ScienceCh 8 · Topic 3
Changes of State
Learning how water changes between solid, liquid and gas with temperature change.
Core concept
These changes of state are physical changes, meaning the substance itself (like water, H₂O) remains chemically the same — only its physical form changes. The temperature at which a substance melts or boils is a fixed physical property for that substance under given conditions; for instance, water always melts at 0°C and boils at 100°C at sea-level atmospheric pressure, but this can shift slightly at different altitudes or pressures, such as boiling at a lower temperature on a high mountain.
Exam highlight
Key diagram
- Show a diagram of ice-water-vapour with arrows labeled melting, freezing, evaporation, condensation.
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Quick notes
• Melting: solid → liquid. Freezing: liquid → solid.
• Evaporation: liquid → gas (at the surface, any temperature). Boiling: liquid → gas (throughout, at a fixed temperature).
• Condensation: gas → liquid.
• Water melts at 0°C and boils at 100°C at sea level; this can shift with altitude/pressure.