How much does 4 mm glass weigh?

Answer 1

the amount something weighs, depends on the volume of it you have and how dense it is. Though glass will have a fairly consistent density, in your question you only mention the thickness, if that glass were to cover an area of 50 square miles it would weigh more than if it only covered an area of 10 square millimetres.

Answer 2

The weight of 4mm glass would depend on the dimensions of the glass, as weight is determined by both thickness and surface area. On average, the weight of 4mm thick glass can range from about 10 pounds per square foot.