Question

25. When is a change said to have taken place in a material ? Explain with the help of an example.
26. What is meant by "reversible changes and
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Fynlain with examples​

Answer 1

Answer:

Ans 25. A change said to have taken place in a material when some stress in the form of pressure or temperature is applied on the material. For ex, a temperature raise may melt the material.

Ans 26.

change which can be reversed to form the 'original substance' is called a reversible change. Ice is a solid substance. When we heat ice, it melts to form liquid water. ... Examples of reversible changes are: Melting of ice.

Answer 2

Answer:

25. A change said to have taken place in a material when some stress in the form of pressure or temperature is applied on the material. For ex, a temperature raise may melt the material.

26. Reversible changes are changes that can be reversed. Most of the physical changes are reversible. for example - ice melts to form water and water can again be freezed to form ice. Irreversible changes are changes that cannot be reversed.

Explanation:

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