6. Changing a SOLID to a LIQUID to a GAS requires

Energy (latent heat)

Explanation:

Latent heat of fusion for solid to liquid

Latent heat of vaporization for liquid to gas.

it requires the present of heat

Explanation:

when there is heat the solid will melt into liquid and from liquid when it is heated for example when water is heated it evaporate into vapor which is gas

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