A physical change is a change in which only the physical properties of a substance change. The chemical composition remains the same and no new substance is formed.
Common examples include melting of ice, boiling of water, cutting paper, breaking glass and dissolving sugar in water. In these examples, the substance may look different, but its basic chemical nature does not change.
Important Features
- No new substance is formed.
- The change is usually reversible.
- Only state, shape, size or appearance changes.
- Chemical composition remains the same.
Example
When ice melts, it becomes water. Ice and water both are H2O. Only the state changes from solid to liquid. Therefore, melting of ice is a physical change.
Physical Change vs Chemical Change
In a chemical change, new substances are formed. In a physical change, no new substance is formed. This is the key difference students should remember.
Physical change wo change hai jisme substance ki physical properties change hoti hain. Chemical composition same rehti hai aur new substance nahi banta.
Ice ka melt hona, water ka boil hona, paper cut karna, glass tootna aur sugar ka water me dissolve hona examples hain.
Important Features
- New substance nahi banta.
- Change usually reversible hota hai.
- State, shape, size ya appearance badalta hai.
- Chemical composition same rehti hai.
Example
Jab ice melt hoti hai to water banta hai. Ice aur water dono H2O hain. Sirf state solid se liquid hoti hai, isliye ye physical change hai.
Topic Wise Detailed Notes
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