We leave our glass calculator at your disposal, so that you can quickly and easily
determine the weight of your glass shelves and save time by avoiding manual
calculations:
Note: Glass weight is calculated in units of kilogram-force (kgf).
HOW TO CALCULATE THE WEIGHT OF A GLASS?
Although you have our glass calculator available above, in this section we
explain how to manually calculate the weight of glass. This is important
information to be taken into account by all professionals who work with this
material in any of its variants.
The first thing you should know when calculating the weight of a glass is the
value of the density of the material (we use a density of 2500 kg/m³). Based on the
classic formula for calculating density, we will obtain the equation that allows the
calculation of the mass of the glass shelves:
Mass (kg) = Density (kg/m³) x Volume (m³)
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:
Weight (N) = Mass (kg) x Earth Gravity (m/s²)
Talking about weight in kilogram-force is somewhat confusing, although it is
unintentionally the most common. We usually say: this item weighs 70 kilos or I
weigh 75 kilos. Without knowing it, we are referring to kilograms of force and not
kilograms of mass. This confusion is old and part of the weight concept of the old
technical system of units.
Weight (kgf) = ?
This system established that a kilogram-force (1 kgf) or kilopond was the weight
exerted by a kilogram (1 kg) of mass under the effect of Earth's gravity. Just like
that, without multiplying anything, without converting any unit. Therefore, the use
of the shortened word kilo was normalized without referring to whether it was
mass or force. Because for purposes of the old concept, the numerical value of
mass and kilogram-force were the same (although one represented mass and the
other force).
So having clarified the issue of weight in kilos, the correct thing is to specify and
normalize the use of units in kilogram-force or in newtons. For example: a shelves
with a mass of 4 kilograms (kg), has a weight of 4 kilograms of force (kgf) or 39.25
newtons (N).
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