Classify correct or incorrect. convection only occurs in liquids? all substances radiate heat? our body temp. is always equal to the temp. around us?

1. Incorrect, it occurs in gases as well or generally in fluids.

2. Correct.

3. Incorrect.

Explanation:

Hello,

1. Convection, is a heat transport phenomena which occurs when a fluid transfers energy in the form of heat to a surface or vice-versa, in such a way, it occurs fluid, say, in both gases and liquids.

2. In this case, radiation is a heat transfer phenomena which occurs by thermal waves transferring the heat; such waves are generated by a hot body which it is said to irradiate the waves by cause of its inner temperature, therefore, as it could be surrounded by a colder space, heat is transferred. As a result of the high temperature, all substances could radiate heat.

3. In this case, it is widely known that normal temperature is between 20 and 25 ºC while the body's inner temperature is about 37 ºC for our organism to work properly. In such a way, those temperatures are different.

Best regards.

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