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March 5, 2015

March 5, 2015

Posted by **Lily** on Wednesday, November 25, 2009 at 8:10pm.

- Physics -
**MathMate**, Wednesday, November 25, 2009 at 11:55pmGauge pressure is the pressure relative to the ambient atmospheric pressure.

A pascal (Pa) is the unit of measurement of pressure equivalent to 1 N (newton) acting on an area of 1 m².

To produce a pressure sufficient to suck water to a height of 187 mm, the pressure is equivalent to the total weight of 187 mm high of water in a container exactly 1 m³ in area.

Let g=acceleration due to gravity, m/s²

Pressure = mg N

=(0.187*1*1) m³ * 1000 kg/m³ * 9.8 m/s²

= 18326 pascals

= 18.326 KPa

Since to suck water, the pressure must be negative, so the required gauge pressure is -18.3 KPa.

- Physics-corr -
**MathMate**, Thursday, November 26, 2009 at 12:03amSorry, the numerical value was erred by a factor of 10. It should read:

= 1833 pascals

= 1.83 KPa

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