2.6×10−31 J2.6 \times 10^{-31} \mathrm{~J}2.6×10−31 J
2.6×1031 J2.6 \times 10^{31} \mathrm{~J}2.6×1031 J
2.6×1013 J2.6 \times 10^{13} \mathrm{~J}2.6×1013 J
1.6×10−13 J1.6 \times 10^{-13} \mathrm{~J}1.6×10−13 J
