Help pls!!
What is the difference between physical change and chemical change?

The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question.  In a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition

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the product of the pressure and volume is also constant

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

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