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The two most important measurements of a book are size and weight. These can be measured in terms of volume and mass respectively. They appear on the spine and the back cover or back panel of a book. A long thin volume with large dimensions is generally regarded as a lighter volume than a square heavy one, since surface area is proportional to length squared, but this is not necessarily always true since it depends on the density or specific gravity value for each material being used in construction. As for weight, either kilograms per cubic metres or metric tonnes per cubic metre can be used as units if needed to calculate these values from volumes and surface areas respectively. The size of the book has an influence on its meaning. The definition of a book or volume is that it contains at least one sheet i.e. one extruded rectangle. A book may have many sheets, but not all are pages i.e. not all are extruded rectangles because some contain actual printed text, others contain blank paper space for text to be printed on later, and still others could be blank paper space for something else to be placed next to the printed text later, etc. Larger books have more pages in them which makes them appear larger. This is because of an optical illusion. The size of the page is the same, but as one page is larger than another, there are more blank spaces per page, so this results in a more cluttered appearance of the book as a whole for reading purposes. As books get larger they appear to have more text on each facing page spread even though the book may have less printed text per facing page spread. This is because of an optical illusion, as any small text on a large sheet on a facing page will appear to be placed further away from the reader than a small amount of text on a smaller sheet placed nearer to the reader. The same is true for a book of documents, although it seems less obvious because a two-paged document will seem to have many more lines of text spread across the two pages than a single-paged document. A smaller book can be printed in a single sheet, but this would be the same size as the book itself. If there are more pages in a single sheet than there are in a volume, then the volume size must be reduced by volume reduction factor to get the correct value. If there are fewer pages in each volume then each page must be printed greater than its actual size to compensate for this. If there are fewer pages per sheet, then each page must also be smaller than its actual size. If there are fewer pages per volume, then the pages must be proportionately smaller to compensate for this. A thicker book requires more paper i.e. it uses more sheets. Its binding can also require extra material i.e. it will use more sheets and may therefore use greater quantities of adhesive, glue and/or glue like substance like those used on construction type materials such as plywood and chipboard etc. This may all result in a greater overall weight of the book than a thinner book with exactly the same number of pages or less per sheet or volume. cfa1e77820