Factors affecting liquid pressure

Hi, may I ask what are the factors that affect liquid pressure?

Is the liquid in an enclosed container?  (temperature, density) Is the liquid not in an enclosed container, just resting at the surface of the Earth?  (depth, significant because pressure results from weight of liquid above which results from force of gravity of the Earth; mass-density considerations, also relating to temperature but complicated by pressures that compress the liquid more and more at deeper and deeper depths)

Google it:  PV=nRT

That's for a static fluid.  A moving fluid is subject to an additional factor, but I don't have the equation handy now.

sage for ideal gas law applied to a liquid(not necessarily ideal)

So which has the highest octane rating then, Ideal or Super Unleaded?

>>1
Mostly external pressure, but temperature matters too.

>>3
I think you're referring to
http://en.wikipedia.org/wiki/Bernoulli%27s_equation

>>4
Liquids are in general very hard to compress.  Consider the difference between crushing a full bottle of water, and an empty bottle of water (full of air, which is a gas).

>>5
How is that related?

>>2

so, temperature does affect enclosed liquid pressure? is it because of the decreased density due to increased temperature causing pressure to decrease?

>>7

enclosed as in resting in maybe a beaker or pail

>>7
Look at PV=nRT ... if by "enclosed" you mean "can't change in volume", then as T rises, the only other variable that can change is P.  V can't change since the liquid is enclosed.  R and n can't change since they are constants.  So in an enclosed fluid, a rise in temperature (induced from the outside) will cause the pressure in the fluid to rise.

>>8
That's not really enclosed.  That's just "contained", and in most fluid problems, there is some container used.  Of course, there is the special case when the fluid is enclosed, but there's also a gas in the enclosure with it.  A fine example is a 2-liter of soda.  There's a little bit of gas-filled space above the liquid.    That little bit of space is going to change how the pressure changes.

(Thanks for the link 4tran.  Bernie's E is only one of the most famous equations by name.  I guess I gotta facepalm myself, LOL.)

>>7
... Are you in elementary school? This is 7th-grade material.

>>9
The ideal gas law might provide some qualitative insight into how a liquid behaves as a function of temperature and pressure, but I think it's quantitatively, very wrong.

1st reason: liquids have tremendous interparticle interactions

Ideal gases are assumed to be non interacting particles, but even for some interacting gases, one can make adjustments with the van der waals equation.  For liquids, the particle interactions would completely dominate the equation, and I highly doubt the accuracy of this equation in this limit.
http://en.wikipedia.org/wiki/Van_der_Waals_equation

2nd reason: bulk modulus (how amenable something is to compression) doesn't fit.

Ideal gases have a bulk modulus that is conveniently, just P.  So at atmospheric pressure, this comes out to ~ 10⁵ Pascals.  Water, however, has a bulk modulus of ~ 10⁹ Pascals.

To put it in simpler terms: a helium balloon will halve its size when subjected to twice the pressure, but a glass of water will look the same.

>>11
Also, liquid volume changes very little over a wide temperature range, whereas gas volume is directly proportional.

Conclusion: Redcream is a retard.

Actually,the factors are only:
1) depth of liquid
2) Density of liquid
3) pressure of air or other gas above the liquid surface.
4) acceleration due to gravity, but for practical purposes this plays little part.

i can has wikipedia too?

do liquids and gasses exerts pressure

>>15
I say yes

لا يوجد إجابة لهدا السؤال بحثت في كل الانترنت زلم اجد جواب

عوامل التي تؤثر على ضغط السائل ، وهذا هو الضغط على عمق معين تحت سطح الأرض ، هي :
1) depth of liquid 1) عمق السائل
2) Density of liquid 2) كثافة السائل
3) pressure of air or other gas above the liquid surface. 3) ضغط الهواء أو الغاز الأخرى فوق سطح السائل.
4) acceleration due to gravity, but for practical purposes this plays little part. 4) التسارع الناتج عن الجاذبية ، ولكن لأغراض عملية يلعب هذا جزء قليل جدا.

derp

herp

ferp