| http://www.w3.org/ns/prov#value | - Furthermore, since there is a case where the nozzle back pressure Pn suddenly decreases when the flow rate of water is low, the relation between the flow rate of water Q and the nozzle back pressure Pn in case of using commercially available nozzles for water spray at the time of low flow rate of water is also shown in FIG. 19 as a reference.
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