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Paper density
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<p>Paper density is a <a href="/facts/Paper/FUETwwKV">paper</a> product's <a href="/facts/Mass/HHdc8XmF">mass</a> per <a href="/facts/Unit_of_volume/q0pRQd4e">unit</a> <a href="/facts/Volume/aeAXCBUd">volume</a>. The <a href="/facts/Density/92p6hh9I">density</a> can be calculated by <a href="/facts/Division_(mathematics)/FqLKNkmq">dividing</a> the <a href="/facts/Grammage/h6vfTXn7">grammage</a> of paper (in <a href="/facts/Grams_per_square_metre/h6vfTXn7">grams per square metre</a> or "gsm") by its <a href="/facts/Grammage/h6vfTXn7">caliper</a> (usually in <a href="/facts/Micrometre/7eDFxD2L">micrometres</a>, occasionally in <a href="/facts/Thousandth_of_an_inch/6jJ6uVUn">mils</a>). </p><p>The "<a href="/facts/ISO/IacYR7Yg">ISO</a> 534:2011, Paper and board — Determination of thickness, density and specific volume" indicates that the paper density is expressed in <a href="/facts/Gram_per_cubic_centimeter/qGLL4w7D">grams per cubic centimeter</a> (g/cm3). </p>