Quantity
<p ><b>Quantity</b> is a <a href="http://en.wikipedia.org/wiki/Property(philosophy)" title="Property (philosophy)" >property</a> that can exist as a <a href="http://en.wikipedia.org/wiki/Magnitude(mathematics)" title="Magnitude (mathematics)" >magnitude</a> or <a href="http://en.wikipedia.org/wiki/Counting" title="Counting" >multitude</a>. Quantities can be compared in terms of "more", "less" or "equal", or by assigning a numerical value in terms of a unit of measurement. Quantity is among the basic <a href="http://en.wikipedia.org/wiki/Class(philosophy)" title="Class (philosophy)" >classes</a> of things along with <a href="http://en.wikipedia.org/wiki/Quality(philosophy)" title="Quality (philosophy)" >quality</a>, <a href="http://en.wikipedia.org/wiki/Substance_theory" title="Substance theory" >substance</a>,<a href="http://en.wikipedia.org/wiki/Change" title="Change" >change</a>, and relation. Being a fundamental term, quantity is used to refer to any type of quantitative properties or attributes of things. Some quantities are such by their inner nature (as number), while others are functioning as states (properties, dimensions, attributes) of things such as heavy and light, long and short, broad and narrow, small and great, or much and little. A small quantity is sometimes referred to as a<b>quantulum</b>.
Two basic divisions of quantity, <a href="http://en.wikipedia.org/wiki/Magnitude(mathematics)" title="Magnitude (mathematics)" >magnitude</a> and multitude, imply the principal distinction between continuity (<a href="http://en.wikipedia.org/wiki/Continuum(theory)" title="Continuum (theory)" >continuum</a>) and <a href="http://en.wikipedia.org/wiki/Discontinuity" title="Discontinuity" >discontinuity</a>.</p>
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Under the names of multitude come what is discontinuous and discrete and divisible into indivisibles, all cases of collective nouns: <i>army, fleet, flock, government, company, party, people, chorus, crowd, mess, and number</i>. Under the names of magnitude come what is continuous and unified and divisible into divisibles, all cases of non-collective nouns: <i>the universe, matter, mass, energy, liquid, material, animal, plant, tree</i>.</p>
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Along with analyzing its nature and classification, the issues of quantity involve such closely related topics as the relation of magnitudes and multitudes, dimensionality, equality, proportion, the measurements of quantities, the units of measurements, number and numbering systems, the types of numbers and their relations to each other as numerical ratios.</p>
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Thus quantity is a property that exists in a range of magnitudes or multitudes. <a href="http://en.wikipedia.org/wiki/Mass" title="Mass" >Mass</a>, <a href="http://en.wikipedia.org/wiki/Time" title="Time" >time</a>, <a href="http://en.wikipedia.org/wiki/Distance" title="Distance" >distance</a>, <a href="http://en.wikipedia.org/wiki/Heat" title="Heat" >heat</a>, and angular separation are among the familiar examples of <a href="http://en.wikipedia.org/wiki/Quantitative_property" title="Quantitative property" >quantitative properties</a>. Two magnitudes of a continuous quantity stand in relation to one another as a <a href="http://en.wikipedia.org/wiki/Ratio" title="Ratio" >ratio</a>, which is a<a href="http://en.wikipedia.org/wiki/Real_number" title="Real number" >real number</a>.</p>