When water is cooled, it freezes and becomes ice. When water is heated, it boils and becomes steam. These changes in state occur due to temperature variations.
NCERT Book Curiosity Science Class 6
Chapter 1 The Wonderful World of Science Class VI
What happens to water when it is cooled and when it is heated?
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When water is cooled, it contracts until 4°C, then expands as it freezes into ice at 0°C. When heated, water expands and turns into vapor at 100°C, transitioning from liquid to gas, undergoing thermal expansion.