wich gas law explains the principle behind air bags?
90832
It'd use the ideal gas law.\n\nAir bags work, last I checked, by the explosive decomposition of sodium azide.\n\n2NaN3 ----> 2Na + 3N2\n\nWhen the azide decomposes, nitrogen is released and fills the bag. Remember:\n\nPV = nRT.\n\nThe bag has a relatively constant volume (give or take its slight elasticity) and n increases exponentially. The number of moles increases and the volume remains constant, so the pressure has to increase. The pressure increases, causing the bag to go form being deflated and flat to fill and firm.
455663
When aircraft are flying, they build up an electric charge from the surrounding atmosphere.  The tires help to safely conduct that charge to the ground when the aircraft lands.
240279
The air we breathe is 78% nitrogen, 21% oxygen and a small amount of trace gases.  Under normal conditions, the air provides the oxygen which allows other fuels to burn.\nHowever, under pressure and very high temperatures (such as in a automoblie engine), the nitrogen can chemically combine (burn) with the oxygen gas to form a series of compounds called nitrogen oxides.  Some of these are serious air pollutants.\nSee the site below for additional information:
29235
air-it is all about the air
991569
Yes this is an important topic.\nthe amount is tiny really.\nwhy not try to blow up a balloon and never burst it then all th gas will be traped and not effect the environment\nx x x
381192
Rocket Principles\nA consquence of Newton's laws of motion is that for any object, or collection of objects, forces which only involve those objects and nothing else ("internal forces") cannot shift the center of gravity. For example, an astronaut floating in a space suit cannot shift his position without involving something else, e. g. pushing against his spacecraft. The center of gravity--or "center of mass"--is a fixed point, which cannot be moved without outside help (turning around it, however, is possible).\n\nBy throwing a heavy tool in one direction, the astronaut could get moving in the opposite direction, though the common center of gravity of the two would always stay the same. Given a bottle of compressed oxygen, the same result follows from squirting out a blast of gas (a scene that appeared in an early science fiction film). A rocket does much the same, except that the cold gas is replaced by the much faster jet of glowing gas produced by the burning of suitable fuel. At present, rockets are the only means capable of achieving the altitude and velocity necessary to put a payload into orbit.\n\nA rocket engine is a machine that develops thrust by the rapid expulsion of matter. Most rockets today operate with either solid or liquid propellants. The word propellant does not mean simply fuel, as you might think; it means both fuel and oxidizer. The fuel is the chemical rockets burn but, for burning to take place, an oxidizer (oxygen) must be present. Jet engines draw oxygen into their engines from the surrounding air. Rockets do not have the luxury that jet planes have; they must carry oxygen with them into space, where there is no air.\n\nThere are a number of terms used to describe the power generated by a rocket. \n\n\nThrust is the force generated, measured in pounds or kilograms. Thrust generated by the first stage must be greater than the weight of the complete launch vehicle while standing on the launch pad in order to get it moving. Once moving upward, thrust must continue to be generated to accelerate the launch vehicle against the force of the Earth's gravity. To place a satellite into orbit around the Earth, thrust must continue until the minimum altitude and orbital velocity have been attained or the launch vehicle will fall back to the Earth. Minimum altitude is rarely desirable, therefore thrust must continue to be generated to gain additional orbital altitude.\n\nThe impulse, sometimes called total impulse, is the product of thrust and the effective firing duration. A shoulder fired rocket has an average thrust of 600 lbs and a firing duration of 0.2 seconds for an impulse of 120 lb-sec. The Saturn V rocket, used during the Apollo program, not only generated much more thrust but also for a much longer time. It had an impulse of 1.15 billion lb-sec.\n\nThe efficiency of a rocket engine is measured by its specific impulse (Isp). Specific impulse is defined as the thrust divided by the mass of propellant consumed per second. The result is expressed in seconds. The specific impulse can be thought of as the number of seconds that one pound of propellant will produce one pound of thrust. If thrust is expressed in pounds, a specific impulse of 300 seconds is considered good. Higher values are better. A rocket's mass ratio is defined as the total mass at lift-off divided by the mass remaining after all the propellant has been consumed. A high mass ratio means that more propellant is pushing less launch vehicle and payload mass, resulting in higher velocity. A high mass ratio is necessary to achieve the high velocities needed to put a payload into orbit.\n\nThere are three categories of chemical propellants for rocket engines: liquid propellant, solid propellant, and hybrid propellant. The propellant for a chemical rocket engine usually consists of a fuel and an oxidizer. Sometimes a catalyst is added to enhance the chemical reaction between the fuel and the oxidizer. Each catego
263853
Air is composed of various gases in our atmosphere.\nNitrogen N2  78.084 % \n \nOxygen O2 20.9476 % \n \nArgon Ar 0.934 % \n \nCarbon Dioxide CO2 0.0314 % \n \nNeon Ne 0.001818 % \n \nMethane CH4 0.0002 % \n \nHelium He 0.000524 % \n \nKrypton Kr 0.000114 % \n \nHydrogen H2 0.00005 % \n \nXenon Xe 0.0000087 % \n\nThe most common and cheapest way to extract oxygen is to pass air through something that will take out everything BUT the oxygen. Thankfully we have a material called zeolite that does just that. When air is passed through the zeolite the nitrogen and other gases are bound to the zeolite and lets the oxygen pass through. This is then pushed into a storage tank. The zeolite is then placed in a vaccum to remove the nitrogen and other gases and then more oxygen comes in. You can generate oxygen also from the electroylsis of water, but thats not as common.
619905
The laws are Boyle, Charles, and Avagadro's. You can derive each of these from the ideal gas equation. PV = nRT.\n\n(1) In this problem you are given initial pressure (333 Kpa), initial volume (250 L), and the final volume (350 L). So to find the final pressure use Boyle's law (P1V1 = P2V2). Use algebra to re-arrange for P2.                  P2 = P1V1/V2 = (333 Kpa x 250 L) / 350 L = 237 Kpa. A qucik way of checking this conceptually: You should know that volume and pressure are inversely proportional to each other. So this means that if volume is increased, then the pressure has to decrease. In this problem, you had a volume increase so the pressure should be less than the initial pressure (which it is).\n\n(2) The formula for methane is CH4. For this problem, just think about it conceptually. Pressure and volume are inversely proportional. So if the pressure is tripled, that means the volume will decrease by a factor of 3. If you started with an initial volume of 15 L, the final volume should be 5 L. \n\n(3) The formula for ethane is C2H6. This problem deals with Charle's law: V1/V2=T1/T2. Volume and temperature are directly proportional, as the temperature increases so does the volume. The initial volume is 450 L, initial temperature 30 C, final temperature 90 C, and the final volume is unknown. Plugging these values into the equation: V2 = V1 x (T2/T1) = 450 L x (90 C/30 C) = 1350 L. You know that the volume and temperature are directly proportional, so if the temperature was increased by a factor of 3, then the volume should also increase by a factor.\n\n(4) This problem is the same as #3, except now you are dealing with pressure and temperature. If the volume is held constant, then pressure is directly proportional to temperature. The initial temperature is 45 C, the final temperature is 20 C, the initial temperature is 2.5 atm, and the final pressure is unknown. The equation that you want to use is: P1/P2 = T1/T2. Re-arranging the equation to solve for P2:     P2 = P1 x (T2/T1) = 2.5 atm x (20 C/45 C) = 1.11 atm. So as you decreased the temperature the pressure also decreased.
757981
Ideal gas law\n\nPV=nRT\n\nP is pressure\nV is volume\nn is moles of gas\nR is the ideal gas constant\nT is temperature\n\nGood luck!
59561
there is a hole in the end of the nozle.when that hole fall below the gas line, pump senses stop of air flow and stops pumping gas. (when you pump gas in you are also pushing air out.) Thats why if you pull the nozzle out some you can get more gas in. You are moving the hole above the gas line.
1128521
gas cools down if it expands suddenly.\n\nsimilar principle is used in AC and refrigerators.
544724
are you talking about the ideal gas law? if so...\n\nThe ideal gas law is the equation of state of an ideal gas. The state of an amount of gas is determined by its pressure, volume, and temperature. The equation has the form\n\n    pV = nRT\n\nwhere\n\n    p:is the pressure (kPa),\n    V:is the volume (L),\n    n:is the number of moles of gas (mol),\n    R:is the gas constant, and\n    T:is the temperature (K).\n\nR is commonly approximated to 8.31 J·K-1·mol-1 when using Pa for pressure. However this can vary if using a different unit for pressure (see gas constant).\n\nso...\nV=nRT/p\nn=pV/RT\n\n\n\nor do you need density?\n\nDensity=Mass/Volume\n\n\n\nor\n\nVolume=length*width*height
977702
It is just like going to the bottom of a swimming pool.  The deeper you go, the more weight of water is above you.  The atmosphere also behaves as a fluid, but it is a gas.  With gases, the greater the pressure, the closer the gas molecules are to each other which means the gas has more mass per unit volume at sea level than it does at higher elevations.  Temperature in gas is due to the energy of the collisions of the gas molecules with each other.  The greater the number of collisions, the higher the energy (heat).  When gas expands the thermal energy is distributed over a larger volume which relates to a decrease in temperature.  Compressing the gas (example: a cylinder and piston) will concentrate the energy in a smaller space, elevating the temperature.  Which is why diesel engines do not require spark plugs.
467845
how indepth do you want this?\n\nbasically caused by a pressure differential in your lungs (the diaphragm inflates the lungs)...the oxygen molecules are forced through alveoli (sacs) into the bloodstream because fo this pressure differential...at the same time...Carbon Dioxide flows in the opposite direction from the blood to teh lungs to be exhaled...the oxygen attaches itself to hemoglobin..which is found in the red blood cells...and is then transported throughout the body by the heart (arteries pump blood away from the heart to teh body..veins take the blood back)\n\nhope thats good enough lol
76519
There is a sensor called an accelerometer that measures the acceleration of your car. When in an accident, you accelerate (or decelerate, if you prefer) faster than possible with brakes. This is how the car senses you are having an accident.\n\nAt this point, a small explosive charge goes off, popping the air bag open and inflating it rapidly between you and the steering column. Front air bags have been proven to reduce head and neck injuries in high-speed collisions.
1074027
I think it has something to do with the excess air trapped inside of it.
499971
When gas is compressed in a thermally insulated vessel the gas is heated.\n\nWhen pressure increases temperature increases.\n\nSimilarly if the gas is expanded in a thermally insulated vessel the gas is cooled.\n\nWhen the pressure decreases the temperature decreases. \n\nNear earth’s surface, the atmospheric pressure is very high.\n\nAt a height of 30km from the surface, the pressure of air is almost zero.\n\nThough the hot air goes up; as it goes up the pressure decreases and volume increases (density decreases) and as per the  gas equation the temperature decreases.