# Buoyancy correction

Is this equation correct?
equation 1: mass=density(density-density)
Im asking this because in air correction we have equation 2: mass=density(density-density)/density(density-density) -----here we get mass.But get we mass still in this case?:mass=density(density-density)
Because I was trying to derive this using a dimension principle,but it doesn t fit in equation 1,because:m=kg/m3*kg/m3 which is kg2/m6 and this doesn t equal to mass.
Please try to explain me this by using dimension principle as well.
Thanks

Last edited:

haruspex
Homework Helper
Gold Member
2020 Award
Mass = density * volume. Why would you ever multiply densities?
If you are considering an 'air correction', it sounds like you're confusing mass with weight.

Thanks,I just want to know if mass=density(density-density) is correct,because as I said,mass has kg unit and right side of equation has kg2m6,so I think,that it is impossible.But I just want to ensure....Am i right?

haruspex
Homework Helper
Gold Member
2020 Award
I don't understand what you mean by density(density-density). Do you really mean taking the difference of two densities and multiplying another density? That would be bizarre. Where are you getting that from? And what are these two or three densities the densities of?

lurflurf
Homework Helper
That should be
buoyancy correction=(volume sample-volume standard)density atmosphere