Percent by weight or volume? Big difference!

When researching quartz counter tops, I discovered that this man made material is made from ground up quartz with a polyester resin binder material.  Wanting to know how much stone and how much resin, I read further to find out that the material is approximately 93% stone and 7% resin.  I was having a hard time visualizing how such a small amount of binder could work.

Reading further I discovered that the  93% and 7% is based on the weight of the components, but since the stone is much heavier per volume than the polyester resin binder, the percentages by volume should be different, and indeed they are.

By volume, it turns out that the same material calculates to 66% quartz and 34% resin binder.  Big difference.

 

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