 | A foot of water or foot water column (foot WC, ftAq, ftH₂O) is a non-SI unit of pressure. It is defined as the pressure exerted by a column of water 1 foot in height at 39 °F or 4 °C (temperature of maximum water density) at the standard acceleration of gravity;
1 ftAq is approximately equal to 22.42 Torr at 4 °C. |
  
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