Type H20 in cell
With mouse, select the 2
Use Format|Cell and open Font tab
Click in the subscript box
Similar steps work for m3. But for squared and cubed you can also:
A)Type m; hold ALT and type 179 on numeric keypad to get m^3.
B) Type cm; hold ALT type 0178 om numeric keypad to get cm^2
On my Gateway while holding down Fn and Alt, I have to use the dummy
numeric keys - the ones in blue on the regular letter keys.
Odd, one cannot even use an external numeric keypad to get ALT characters.