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<p>as <a href="page.php?w=energy">energy</a>. An example of advection is the transport of <a href="page.php?w=pollutant">pollutant</a>s or <a href="page.php?w=silt">silt</a> in a <a href="page.php?w=river">river</a> by bulk water flow downstream. Another commonly advected quantity is energy or <a href="page.php?w=enthalpy">enthalpy</a>. Here the fluid may be any material that contains thermal energy, such as  <a href="page.php?w=water">water</a> or <a href="page.php?w=air">air</a>. In general, any substance or conserved <a href="page.php?w=Intensive_and_extensive_properties">extensive</a></p><p>
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