What is the density of soda-lime glass?

2,500 kg/m³ (2,440–2,530), or 2.50 g/cm³.

Does soda-lime glass float?

No. At 2,500 kg/m³ it is denser than water.

Soda-lime glass

Density of soda-lime glass

2,500 kg/m³ (2,440–2,530)

2.50 g/cm³ · 156.1 lb/ft³

About 90% of all glass made, and the reason it is cheap is the soda: pure silica melts at 1700 °C, adding sodium carbonate drops that to around 1000 °C, and the lime is added back to stop the result dissolving in water. It has no melting point, softening gradually from about 720 °C, which is exactly what makes glassblowing and float production possible. Its theoretical tensile strength is enormous and its practical strength is 30-90 MPa, because glass always fails from a surface flaw — which is why scoring a line lets you snap a sheet along it.

Properties

Density: 2,500 kg/m³ (2,440–2,530) — 2.50 g/cm³
Tensile strength: 30–90 MPa
Young's modulus: 70 GPa
Thermal conductivity: 1 W/(m·K)
Hardness: 5.5 Mohs
Thermal expansion: 9 µm/(m·K)
Floats in water: No
Magnetic: No

What it is used for

Windows and float glass
Bottles and jars
Drinking glasses and mirrors
Light bulb envelopes

How it compares

Water is 1,000 kg/m³. Anything with a shorter bar than water floats in it.

air 1.2 kg/m³

expanded polystyrene foam 20 kg/m³

rigid polyurethane foam 40 kg/m³

Water — the float line 1,000 kg/m³

soda-lime glass 2,500 kg/m³

tungsten 19,250 kg/m³

gold 19,300 kg/m³

platinum 21,450 kg/m³

Water is 1,000 kg/m³. Anything below that floats.
Material	Density	Relative to water
rigid polyurethane foam	40 kg/m³	0.04×
expanded polystyrene foam	20 kg/m³	0.02×
air	1.2 kg/m³	0.00×
soda-lime glass ←	2,500 kg/m³	2.50×
platinum	21,450 kg/m³	21.45×
gold	19,300 kg/m³	19.30×
tungsten	19,250 kg/m³	19.25×

Does it rust?

Soda-lime glass contains no iron, so it cannot rust. Whether it degrades depends on the material, not on oxidation.

Is it magnetic?

Soda-lime glass is not a metal and has no ferromagnetic response.

Common questions

What is the density of soda-lime glass?: 2,500 kg/m³ (2,440–2,530), or 2.50 g/cm³.
Does soda-lime glass float?: No. At 2,500 kg/m³ it is denser than water.
Is soda-lime glass magnetic?: Soda-lime glass is not a metal and has no ferromagnetic response.

Sources

Typical range compiled from manufacturer specifications — At One Place

How these figures are compiled and checked