Rapid Heat
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what is the rapid expansion of air due to heat?
starts with an I, ends with ion, 9 letter word.
Oh, I was going to say "convection," but I guess that doesn't quite work with the "I" part, does it?
Insolation is a measurement of the solar radiation received by a surface over a unit time. Since it's solar radiation, it expands air. Though "rapid" might be a relative term.
Heat Fossil fuel coal, Nordjyllandsværket, Denmark Rapid I
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