Absolute
water for example.absolute pressure; gauge pressure; atmospheric pressure
standard atmospheric pressure at sea level is 14.73 psi Absolute pressure is a gauge plus atmospheric pressure. The gauge being something that you are detecting.. i.e hot water tank.
Atmospheric humidity is defined as the amount of pressure of water vapor in an air to water mixture. This will be influenced by the temperature at a given time.
Water boils when its internal pressure reaches that of the atmospheric pressure. Therefor, if one lowers the atmospheric pressure, the water would boil at a lower temperature (in fact, one can make water boil at room temperature by dramatically lowering the atmospheric pressure).
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Higher altitude decreases the boiling point of water. Boiling point is defined as the point at which the vapour pressure of the substance above the liquid is equal to the external atmospheric pressure. Since the external atmospheric pressure is lower at higher altitudes, a lower vapour pressure of water is required for water to boil and therefore a lower temperature is required to achieve the desired vapour pressure.
If a pressure greater than atmospheric pressure is applied to a solution or pure water, its water potential increases
Because while atmospheric pressure is the greater of the two the vapour pressure of the water can not spontaneously form bubbles (ie boil).
The 'g' added on to bar means 'gauge', as opposed to bara, meaning 'absolute'. The 'zero' of a normal gauge is normally set at atmospheric pressure (things like tire pressure gauges, water gauges etc.) These gauges will read as "10 bar" but really mean that the absolute pressure is 10 bar + atmospheric pressure (~1.01325 bar). Some gauges however are absolute gauges. These might include weather gauges, or gauges on closed processes. bara = barg + atmospheric pressure
Roughly 4.3 psig or 29 kPag on Earth near sea level ("g" meaning gauge pressure, additional to atmospheric pressure).
Just as water pressure is caused by the weight of water, atmospheric pressure is caused by the weight of the air. Pg. 126 Conceptual Physical Science 4th Edition.
the pressure of water measured relative to the atmospheric pressure at the same elevation.