A half inch thick tempered glass will weigh 6.75 lb/ft2. With that much thickness, it can support much of the weight of possibly a small child or small animal.
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Glass weighs 162 pounds per cubic foot. Tempering adds no weight. Glass is glass, except specialty glasses like high temperature glass, which weighs slightly more.
The diameter is 30.6mm, thickness is 2.15mm
Same as half an inch anywhere else.
The radius of a cylinder is half the thickness of its circular cross section.
It is half the thickness (diameter) of the circular cross-section of the cylinder.