Convert therm to mega-electronvolt

The electronvolt is the energy an electron gains crossing one volt, 1.602 × 10⁻¹⁹ J, and is the natural unit of the very small. Chemical bonds and visible light are a few eV, X-rays tens of keV, nuclear gamma rays MeV, and the Large Hadron Collider brings protons to 6.8 TeV each. Through E = mc² it also serves as a mass unit: an electron is 0.511 MeV, a proton 938 MeV, and the Higgs boson 125 GeV.

The British thermal unit, the heat that warms a pound of water by one degree Fahrenheit (1,055 J), is now mostly an American unit. US gas bills are in therms of 100,000 Btu (29.3 kWh), wholesale gas is priced per million Btu (MMBtu), and national energy statistics are in quads, 10¹⁵ Btu: the US uses about 100 quads a year. The ton-hour is the cooling delivered by one refrigeration ton over an hour, 12,000 Btu.