"Hotter" in terms of temperature, not heat flux. Temperature is just a statistical thing that measures the relative motion of matter. You might read about exp

"Hotter" in terms of temperature, not heat flux. Temperature is just a statistical thing that measures the relative motion of matter. You might read about experiments where matter in a near-vacuum reaches insane temperatures, even hundreds of millions of degrees. In these experiments there is almost no matter involved and it's whizzing past other matter at nearly the speed of light, hence at high temperatures. But there's very little energy involved. The temperature is more of a statistical stunt than anything, really. At some point they stop measuring it in degrees and start measuring it in KeV. Anyway, you can have very high temperatures without a lot of heat, just the same as you can have extremely high power without a lot of energy. If I drop my phone on a rock, the instantaneous power of the impact might be extremely high, maybe even megawatts, but only for a microsecond. The total energy involved will not be remarkable. TL;DR: temperature != heat.