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How can a change in color indicate a physical change?

How can a change in color indicate a physical change?
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5 votes
How can a change in color indicate a physical change?

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User Bruno Gelb
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2 Answers

6 votes
Because you can see with your eyes that it changed
answered
User Ivan Voroshilin
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7.1k points
2 votes
A temperature change maybe?
answered
User Sitilge
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8.1k points
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