= Cosmic microwave background temperature in energy units
{title2=$k_BT_0\simeq2.35\times10^{-4}\,\mathrm{eV}=0.235\,\mathrm{meV}$}
The <cosmic microwave background> <temperature> is about $2.725\,\mathrm K$, corresponding to the displayed thermal <energy>. The conversion uses $k_B\simeq8.61733\times10^{-5}\,\mathrm{eV/K}$. Thus $2.35\,\mathrm{meV}$ would correspond to about $27.3\,\mathrm K$, rather than the present <CMB>. Primary references are https://asd.gsfc.nasa.gov/archive/arcade/cmb_temperature.html[NASA's CMB temperature measurements] and https://physics.nist.gov/cgi-bin/cuu/Value?kev[NIST's Boltzmann constant in electronvolts per kelvin].
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