Now, a very common misconception is to confuse weight with mass. This
confusion is made stronger by the unit of force kilopond or kilogram-force (kgf).
The mass of a body is an invariable fundamental unit in any location, while the
weight is the force that a body exerts and that is conditioned by its mass and the
acceleration of gravity.
In our case, with the dimensions of the glass shelves (height, width and thickness)
we obtain its volume. Then with the volume and density we calculate the mass in
kilograms (kg).
Finally, to calculate the final weight we have two options: the traditional option in
newtons (N) and the option in kilogram-force (kgf). In the case of weight in
newtons, simply multiply the mass (kg) by the earth's gravity (9.81 m/s²). In this
way we calculate the force exerted by the mass of the shelves: