Constants in Numbers

Is it possible to define something as a constant in Numbers? For example, if I enter a series of values, I want to divide all of column 'A' by 'x' (each cell separately). I can't seem to find a way to do this without defining 'x' each time (I want 'x' to be a cell, so I can change the x-value as well).

For chemists out there, I'm trying to do standard deviation. The formula is √[{∑(xi-xavg)^2}/{n-1}]

The constant is for the volume. I have a mass, and it must be converted to volume by using the density at a specific temperature, so each mass, in column 'a', becomes a volume in a column 'b', then the formula is applied. I managed to do this with lots of tedious work, but I'd like to streamline it so that if I add more rows (perhaps I'm using 20 test masses one day instead of 3 or 4), I would like to be able to make that change by expanding table.

I'm fairly new to the magic of spreadsheets, and this type of application comes up quite often.

If someone could help me get going in the right direction here, it'd be greatly appreciated.

 

Thank you. I didn't know you could do that. After a bit of scouring, I found the STDEV function as well. It seems my search wasn't thorough enough before. Is there a reference to this $A$1 function in the help documents?