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ambient pressure

Created by: PILearner at: 7/3/2014 10:59 AM (6 Replies)

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7/3/2014 10:59 AM	Rate (1)
PILearner Posts: 80 Rating: (1)	what is an ambient pressure ?
PILearner Posts: 80 Rating: (1)
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7/3/2014 4:24 PM	Rate (0)
Levelmans Bronze Member Joined: 12/13/2012 Last visit: 10/5/2023 Posts: 124 Rating: (45)	Dear PILeaner , The ambient pressure on an object is the pressure of the surrounding medium, such as a gas, which comes into contact with the object. Means, the pressure around you, were you are sitting for the moment is ambient. Cheers Levelmans

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7/3/2014 6:12 PM	Rate (0)
PILearner Posts: 80 Rating: (1)	could you please tell me whats the value of ambient pressure ? is it 1 bar? and can you guide me how to calculate pressure inside a storage tank ?
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7/3/2014 8:03 PM	Rate (0)
danw Gold Expert Joined: 3/28/2010 Last visit: 11/19/2024 Posts: 1081 Rating: (214)	1) Ambient pressure outdoors is barometric pressure, which depends on altitude and weather conditions. It is approx 1 bar (absolute) at sea level. It's my understanding that the unit 'bar' is assumed to be absolute, because is it a measure of 1 atmosphere at sea level (rather than gauge pressure, referenced to atmospheric pressure and denoted barg) 2) Pressure inside a tank depends on whether - head space pressure is developed where something fills the tank under pressure, like a nitrogen blanket, and is maintained with a source and a pressure regulator - vacuum pressure is developed when the tank is evacuated with a vacuum pump or by the removal of material and inadequate venting. - a material's vapor pressure is contained and develops a pressure. For example, the vapor pressure of propane at 60 Deg F (16 Deg C) is 92 psig (637 kPa). - a liquid hydrostatic pressure is exerted on the walls of the tank - pressure is developed by a chemical reaction, like an exothermic reaction where generated heat increases the pressure of any contained liquids or gases. Can I help you calculate any of these? No.

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7/4/2014 5:31 PM	Rate (0)
PILearner Posts: 80 Rating: (1)	thanks a lot Mr. Danw especially for the last sentence "Can I help you calculate any of these? No." Cheers!it made my day Now let me ask you a direct question. How do we calculate pressure in a water storage tank for potable water . let's say its height is 10 m , with water level at 8 m . I want to calculate the pressure of air left in the the last 2 m empty space which will increase and decrease with the level of water?
PILearner Posts: 80 Rating: (1)
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7/6/2014 7:18 PM	Rate (0)
danw Gold Expert Joined: 3/28/2010 Last visit: 11/19/2024 Posts: 1081 Rating: (214)	Check out Boyle's Law. For the same temperature, pressure is inversely proportional to volume.

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7/7/2014 6:48 AM	Rate (0)
SMHZ Bronze Member Joined: 10/19/2012 Last visit: 4/17/2022 Posts: 315 Rating: (9)	[quote user="danw"]Check out Boyle's Law. For the same temperature, pressure is inversely proportional to volume. Isnt Boyle's Law for gases?

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