Buoyancy Equation

The buoyancy equation in chemistry, is used to correct the mass obtained from a measurement made on a balance, specifically when the mass obtained from the balance does not correspond to the object's standard mass density. In physics buoyancy is defined as the upward force on an object which is found in air, gas or liquid. 

Description

The equation is 

where 

• m' is the mass read on balance in units of (g)
• d_a is the density of air which is 0.0012g/mL near 1 bar and 25^oC
• d_w is the density of calibration weights which is 8.0g/mL
• d is the density of object being weighed in units of (g/mL)
• m is the mass of the object weighed in a vacuum in units of (g)

References

Harris, D., Quantitative Chemical Analysis, 9th Ed., W. H. Freeman,  Pp.29 (2015).