Nounpressure (countable and uncountable; plural: pressures)
Derived termsRelated terms
From Wiktionary under the GNU Free Documentation License. Pressure (symbol: p or P) is the force per unit area applied in a direction perpendicular to the surface of an object. Gauge pressure is the pressure relative to the local atmospheric or ambient pressure. DefinitionPressure is an effect which occurs when a force is applied on a surface. The symbol of pressure is p or P. From Wikipedia under the
GNU Free Documentation License What is the osmotic pressure and molar concentration? Q. A)Isotonic saline solution, which has the same osomotic pressure as blood, can be prepared by dissolving 0.923g of NaCl in enough water to produce 100mL of solution. What is the osmotic pressure of this solution at 25C ? B)Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. The osmotic pressures required for this process can be as high as 18.1atm . What would the molar concentration of the tree sap have to be to achieve this pressure on a day when the temperature is 25C? Asked by Melanie - Wed Jul 11 18:48:33 2007 - - 1 Answers - 0 Comments A. Use this equation, osmotic pressure = CRT, where C is the concentration in molarity, R is the gas constant, and T is the temperature in Kelvin. So, the answers to your problems are: A) osmotic pressure = CRT to get C, get the number of moles of NaCl then divide it with volume of the solution mole NaCl = 0.923g / 58.442 g/mol mole NaCl = 0.0158 mol C = 0.0158 mol / 0.1L C = 0.158 mol/L So, osmotic pressure = 0.158 mol/L*(0.082058 L-atm/mol-K)*(25+273K) osmotic pressure = 3.86 atm B) C = osmotic pressure / RT C = 18.1 atm / (0.082058 L-atm/mol-K * 298K) C = 0.740 mol/L Answered by titanium007 - Thu Jul 12 09:54:36 2007 How can i sing without pressure coming to me neck? Q. Whenever i sing at Youth Group, my voice tends to gather up pressure and it then ends up gaining so much that my neck is like pulsing, thats when i sing with my regular voice. But if i sing with a lower voive, it sounds to deep and a little off tone but doesn't gain pressure. So is there a way i relieve this pressure? One problem is i think i'm not breathign enough, but i'm just breathing like you would when you sing. Thanks. Asked by Don - Mon Mar 19 21:44:13 2007 - - 4 Answers - 0 Comments A. Hi there. It sounds to me like you're trying to sing too high for your comfortable range! When you sing it with a lower voice, all you are doing is singing an octave lower. It may sound out of tune, but chances are you are in tune! The musical alphabet repeats itself in octaves (abcdefgABCDEFG...etc...) . So when you're singing lower, basically what is happening is you are singing "a" instead of "A"-- but it's the same note on a different sound frequency. To not get pressure build up in your throat you simply need to breath deeper and use the breath to push the sound out-- not you're throat! Sometime when you're by yourself you should plie or squat. What squating does is lower your center of gravity forcing your body to take a… [cont.] Answered by Sarah S - Tue Mar 20 11:28:05 2007 How to calculate pressure increase through the jet engine inlet?
Q. I have an conical inlet of jet engine, and I know air speed on the entrance Vo, I know entrance diameter Do and diameter at the and of the inlet D1. D1>Do. How to calculate pressure increase at the and of inlet ( pressure in combustion chamber before combustion starts (? Asked by ervetor - Tue Nov 20 02:45:13 2007 - - 2 Answers - 0 Comments A. the pipe looks like - a frustum of a cone with Do & D1 dias mass flow rate (m-dot) = constant = A*v*rho rho =air density, A = pi*(D/2)^2= crossection area, v=speed --- so >> pi*(Do/2)^2 * vo*rho = pi*(D1/2)^2 * v1*rho (Do)^2 * vo = (D1)^2 * v1 v1 = Vo *[Do/D1]^2 --- (1) D1>Do so v1 < vo --- Bernoulli's equ (horizontal pipe, mgh same) Po + 0.5 rho*vo^2 + rho*gh = P1 + 0.5 rho*v1^2 + rho*gh Po + 0.5 rho*vo^2 + rho*gh = P1 + 0.5 rho*v1^2 + rho*gh (P1-Po)= increase in pressure = 0.5 rho[vo^2 - vi^2] ---(2) using (1) (P1-Po)= 0.5 rho* vo^2[1 - (Do/D1)^4] simplify further Answered by anil bakshi - Tue Nov 20 03:14:47 2007 From Yahoo Answer Search: "pressure"  news.google.com guardian.co.uk Photograph: Alessandro Bianchi/Reuters The leaders of the G8 nations today came under pressure to honour their promises to the world's poorest countries as ... and more » news.google.com NESN.com In 2008, there was essentially no pressure on Ryan to win now. Turns out, their expectations were a bit conservative. With the 18th overall pick in the ... and more » news.google.com PC World It appears that the decision was made at least in part due to pressure from PC makers and Internet activists. The government did not set any new deadline ... and more » From Google News Search: "pressure"  biology.clc.uc.edu 595px x 675px | 109.60kB [source page] jpg max pressure P4013663 JPG diastole P4013662 JPG Tuesday April 01 2003 12 05 PM 21457 earpieces P4013656 JPG Tuesday April 01 2003 12 21 PM 112252 max pressure P4013663 JPG Tuesday April  allproducts.com 200px x 200px | 17.90kB [source page] High Pressure Pump  peoplemisters.com 800px x 618px | 113.10kB [source page] Parent Directory 31 May 2003 01 51 High Pressure Pumps jpg 31 May 2003 03 57 113k high pressure pumps > 31 May 2003 03 57 10k From Yahoo Image Search: "pressure"  blogers.bloglines.co.za Business Blogs on Blogged Sun, 12 Jul 2009 01:03:30 GM Forex Trading TV Video Blog US Dollar came under much downward . pressure. on Thursday as the main developing countries led by China increased talk on replacing the USD as the global reserve currency. This helped the...  webmd.com unknown Mon, 06 Jul 2009 21:04:54 GM An amino acid known as glutamic acid, which is found in greater amounts in vegetable protein, is associated with lower blood . pressure. .  haqeeqat.org Insaan hu, 02 Jul 2009 04:46:26 GM While Indians are extremely sensitive about US involvement in Kashmir dispute, they are equally upset over rising US . pressure. to contain their anti-Pakis... From Google Blog Search: "pressure" |
