R∞ a Btu (th)

R∞ a Hz | R∞ a m⁻¹ | R∞ a GHz | R∞ a K | R∞ a THz | R∞ a eV | R∞ a aJ | R∞ a Eh | R∞ a keV | R∞ a fJ | R∞ a MeV | R∞ a pJ | R∞ a u | R∞ a nJ | R∞ a dyn*cm | R∞ a Erg | R∞ a µJ | R∞ a gf*cm | R∞ a oz*f*in | R∞ a gf*m | R∞ a cJ | R∞ a kgf*cm | R∞ a dJ | R∞ a scc | R∞ a lbf*in | R∞ a in*lbf | R∞ a J | R∞ a N*m | R∞ a W*s | R∞ a lbf*ft | R∞ a ft*lbf | R∞ a cal (th) | R∞ a cal (IT) | R∞ a kgf*m | R∞ a kp*m | R∞ a daJ | R∞ a hJ | R∞ a KJ | R∞ a mJ | R∞ a kW*s | R∞ a Btu (th) | R∞ a Btu (IT) | R∞ a CHU | R∞ a scf | R∞ a W*h | R∞ a Kcal (th) | R∞ a Kcal (IT) | R∞ a cal | R∞ a scy | R∞ a MJ | R∞ a mbtu (IT) | R∞ a hp*h | R∞ a hp*h | R∞ a kW*h | R∞ a Kg of TNT | R∞ a ton*h | R∞ a thm | R∞ a thm | R∞ a thm | R∞ a GJ | R∞ a MBtu (IT) | R∞ a mmbtu (IT) | R∞ a EP | R∞ a MW*h | R∞ a ton | R∞ a BOE | R∞ a TOE | R∞ a TJ | R∞ a GW*h | R∞ a kton | R∞ a kBOE | R∞ a PJ | R∞ a Mton | R∞ a BBOE | R∞ a Mtoe | R∞ a kg | R∞ a EJ | R∞ a Gton | R∞ a Gtoe