CFS begins preparing a home for our 100 million degree fusion plasma

[eppur_se_muova]

4. No need. The amount of material at this temperature is relatively small.

Temperature is not a measure of the total energy content, but of the concentration of energy. A large amount of energy in a very small mass gives an enormous temperature, and energy tries to diffuse away more rapidly the more concentrated it becomes, so it can cool off very quickly if it contacts any other matter -- including air.

Technically, temperature is a measure of what is called "number energy density", or the average energy per particle. This is an intensive property, which can be measured at a single point; the total amount of heat in a sample is an extensive property, i.e. it is evaluated over the whole sample and thus depends on the sample size. It's like the difference between pressure (intensive) and force (extensive) -- your dancing partner may not weigh all that much (moderate force) but put all that weight into the tip of a stiletto heel and the resulting high pressure can be quite harmful !