1, A hot solid, a container of hot liquid,
or a group hot gases at high pressure under which the following icons
show "continuous spectrum (Continuous spectrum)".
2, a group under the conditions of low pressure and high temperature
gas, there will be the following icons "radiation spectra (Emission
lines)" show.
3, a mass of low pressure gas is located in a high-temperature
continuous light source before the icons will be as follows,
"absorption lines (Absorption lines)"
Rendering.
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