What is the density of glass?

Answer 1

The density of glass varies with each type and ranges from 2000 to 8000 kg/m3 (for comparison, from less dense than aluminum to more dense than iron) at standard conditions. Flint glass can be so much denser than crown glass because flint glass contains lead, which is a very dense element.

http://hypertextbook.com/facts/2004/ShayeStorm.shtml

This question reminds me of when I was 8 years old and my science teacher told me that glass is actually a liquid. I found out later that it is somewhere between a liquid and a solid, not quite any of them and even if you go to really old churches, at least a few hundred centuries old, the glass at the bottom is a lot thicker than that at the top of windows because it has been slowly flowing downwards for hundreds of years.

But that's besides the point. Just a fun fact.

Answer 2

"Glass properties can be calculated through statistical analysis of glass databases such as SciGlass and Interglad. If the desired glass property is not related to crystallization (e.g., liquidus temperature) or phase separation, linear regression can be applied using common polynomial functions up to the third degree. Below is an example equation of the second degree. The C-values are the glass component concentrations like Na2O or CaO in percent or other fractions, the b-values are coefficients, and n is the total number of glass components. The glass main component silica (SiO2) is excluded in the equation below because of over-parametrization due to the constraint that all components sum up to 100%. Many terms in the equation below can be neglected based on correlation and significance analysis. Further details and examples are available at Glassproperties.com."

Answer 3

2.5 grams per cc For the normal sodalime glass used all around.
2.8 gms /cc for lead crystal glasses.