what is the difference between absolute pressure and guage pressure ?
930186
The difference between absolute pressure and gauge pressure is, by definition, atmospheric pressure.\n\nAbsolute pressure is the pressure difference between the pressure you are measuring and a perfect vacuum. A prefect vacuum has zero pressure. Gauge pressure is the pressure difference between the pressure you are measuring and atmospheric pressure.\n\nTo convert a gauge pressure to absolute pressure, algebraically add the current value of the atmospheric pressure to the measured gauge pressure.
317023
Sounds like a job for Wikipedia!\n\nBlood pressure is the pressure of the blood on the walls of the blood vessels as the heart squirts it through the circulatory system.   When your blood first leaves the pump (your heart) it's moving as fast as it's going to, and there's as much pressure in the system as there's going to be.  The farther from the heart you go, the less the pressure in the system (just like an irrigation system, or the plumbing in a house.)\n\nThe heart not only has to pump the blood out to where it's needed, it has to pump it back again, to run it through the lungs to pick up some more oxygen so it can be recirculated.  Blood pressure is much lower on the return trip, when the blood is way out there far from the pump.  The outbound system is your arteries, the return trip is your veins.  \n\nMostly when you measure blood pressure, it's the pressure in the big arteries that are close to the skin and easy to find without poking any holes (the brachial artery in the arm is an example). \n\nThe traditional way to measure blood pressure is in millimetres of mercury (mm Hg), and you always state it the same way so everyone knows what you're talking about.  From a medical point of view what you're interested in is how much pressure there is in the system when the heart isn't squirting new blood into it (at the "resting" phase or "bottom" of the heartbeat cycle) which is called the diastolic pressure; and then how much pressure there is in the system at the top of the cycle, when your heart is forcing new blood into your arteries, which is called the systolic pressure.  So the "top of the cycle" number goes on top, and the "bottom of the cycle" number goes on the bottom.  A typical reading for a resting, healthy adult is around 120/80 (meaning 120 mmHg systolic and 80 mmHg diastolic)\n\nHope this is what you needed!
1113734
In non viscous fluid mechanics, there are essetially two principle in play : 1. the Principle of Continuity 2. The Bernoulli's Principle\n\n The former states that the rate of flow of liquid is same throughout the length of a pipe etc. i.e A1 * V1 = A2 * V2 ( where A and V are the Area of Cross section and Velocity of liquid at different stages)\nThus, when u squeeze the hose the A decreases and to maintain the equation the V has to increase.\n\nThe Bernoulli's Principle relates the Energies of two different stages :\n P1 + 1/2 p*V1*V1 + p*g*H1 = P2 + 1/2 p*V2*V2 + p*g*H2\n\nWhere P,p,H are the Pressure, density and Height.\n\nSURPRISINGLY, using the above eqn, we find that when we squeeze the hose, the PRESSURE actually decreases rather than what we think logically.
792624
An absolute chart lists numbers that have relationships that are measurable in an exact way. \n\n4 miles is always twice as long as 2 miles.\n\nA relative chart lists numbers that have a relation that is not measurable in an exacting manner.\n\n10 degress celsius is not twice as hot as 5 degress celsius.
1115026
Voltage is simply the potential electrical "pressure" of a circuit.  Current is the actual flow of electrons, so that's what's felt.  Think of it in terms of water & pipes.  You feel the water flow, not the potential pressure behind it.  If there is more resistance (smaller pipes, more valves), the potential pressure of the water doesn't change, but the flow is reduced.
1034025
The pressure rating versus temperature for these classes of flange ratings is independent of the material being contained.\n\nThe best way to get a table or chart of the relationship between pressure and temperature is to contact a pipe, valve and fitting supplier in your yellow pages. If you can't find one, try the online yellow pages for Houston, Tulsa, Oklahoma City, Dallas or New Orleans.\n\nThe actual ratings are part of copyrighted documents published by ANSI and usually aren't available for free.
787069
14 guage wire is larger in diameter than 16 guage wire and has a greater current-carrying capacity.\n\nSee http://en.wikipedia.org/wiki/American_wire_gauge
987167
Atmospheric pressure and physics
1095220
Pressure Gauges and Gauge Attachments\n\nThis Standard was approved by the B40 Standards Committee and approved as an American National Standard by the American National Standards Institute on September 19, 2005.\n\nhttp://engineers.ihs.com/document/abstract/GOFSUAAAAAAAAAAA
474374
Standard atmospheric pressure is 101 325 Pa = 101.325 kPa = 1013.25 hPa = 1013.25 mbar = 760 Torr. This definition is used for pneumatic fluid power (ISO R554), and in the aerospace (ISO 2533) and petroleum (ISO 5024) industries.
967963
Either air pressure, or fluid pressure on a fluid present in the cylinder.
483587
It is basically a u tube manometer.\n\nThe pressure of air in one side (air inside an air bag) of the u tube is measured by the excess of mercury level in the other tube.\n\nThe air bag is made to surround one’ arm and pressure of air inside the bag is increased by pumping air inside.\n\nBecause of high pressure the blood circulation below the arm stops.\n\nBy slowly releasing the pressure and noting the pressure at which circulation of blood starts is noted. This is the highest pressure and again at a lower pressure the pulse is noted this is the lowest pressure.\n\n Systole refers to the contraction of the heart and conventionally systolic arterial pressure is the highest pressure developed in arteries during the ventricular contraction of the cardiac cycle. Diastole refers to a relaxed heart muscle and diastolic pressure has conventionally meant the lowest arterial pressure during a heart cycle. The pulse pressure is related to the amount of blood being pumped per beat. It is the systolic minus the diastolic pressure.
588962
Actually, the 100mm of Hg is a pressure measured relative to atmospheric pressure; that is, the "total" blood pressure is actually 860 mm of Hg, which is (860 - 760) = 100 mm Hg greater than atmospheric pressure.\n\nMany pressures are given this way, in terms of the pressure difference from one atmosphere.  In that case, 0 mm Hg is simply atmospheric pressure, not a vacuum.
650626
Sinking air creates high pressure because it is essentially pushing down on you. Low pressure is the opposite. It occurs when air is rising therefore it will not push down on you or exert any extra force.\n\nSinking air is associated w/ cooler air temperatures, that is, cooler than the air already in place.
941918
If the tube is filled with water, when the tube is inserted water will flow from the upper beaker to the lower one by siphoning.\n\nThe pressure difference will be due to the weight of the water in the upper beaker that is above the surface of the lower beaker.
92719
Let's consider a deep-sea diver. The pressure pushing on the diver is less at shallow depths than at greater depths. This is because at shallow depths, there is a shorter column on water above the diver than there would be at greater depths. But the pressure the diver feels is not just felt from above! The force is transmitted through the fluid and pushes the diver from all directions, even from below. \n\nPressure within the Earth can be thought of the same way that we think of water pressure on a diver. Under the surface of the ocean, you are under pressure from all directions because of the weight of the column of water above you. Within the Earth, an object is under pressure from all directions due to the weight of the column of rock above the object. This pressure is often called confining pressure, because it is the push from all directions that tends to confine material to the smallest possible volume (space).
645900
Boyles Law PV/T I think. Anyway it has to do with the relationship of Pressure to Volume. If one increases the other decreases. Its useful in industry in making liquid Nitrogen and has endless applications in dealing with gasses in Chemisrty and Physics.