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# Topic: Molar gas constant

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 Physical constant - Wikipedia, the free encyclopedia Physical constants can take many dimensional forms: the speed of light signifies a maximum speed limit of the universe and is expressed dimensionally as length divided by time; while the fine-structure constant α, which characterizes the interaction between electrons and photons, is dimensionless. Constants that are independent of systems of units are dimensionless numbers known as fundamental physical constants, and are truly meaningful parameters of nature, not merely human constructs. The weak anthropic principle simply states that it's only because these fundamental constants acquired their respective values that there was sufficient order and richness in elemental diversity for life to have formed, which subsequently evolved the necessary intelligence toward observing that these constants have taken on the values they have. en.wikipedia.org /wiki/Physical_constant   (571 words)

 Gas constant - Wikipedia, the free encyclopedia The gas constant (also known as the universal or ideal gas constant, usually denoted by symbol R) is a physical constant used in equations of state to relate various groups of state functions to one another. It is another name for the Boltzmann constant, but when used in the ideal gas law it is usually expressed in the more convenient units of energy per Kelvin per mole rather than simply energy per Kelvin per particle. The gas constant occurs in the simplest equation of state, the ideal gas law, as follows: en.wikipedia.org /wiki/Molar_gas_constant   (247 words)

 Gas Laws: Ideal Gas Law and the Gas Constant   (Site not responding. Last check: 2007-11-02) The molar concentration, C, of a gas is defined to be C = n/V. In effect, the pressure of the gas should be directly proportional to both the molar concentration and the temperature. Use the slope of the plot to determine the gas constant in units of L atm mole www.chm.davidson.edu /ChemistryApplets/GasLaws/GasConstant.html   (306 words)

 Definition Molar Absorptivity   (Site not responding. Last check: 2007-11-02) Molar absorptivity (1639 bytes) 1: In [[analytical chemistry]], the '''molar absorptivity''' or ''extinction coefficient... The definition of the extinction coefficient (molar absorptivity) for the... In analytical chemistry, the molar absorptivity or extinction coefficient andepsilon; of a chemical species at a given wavelength is a measure of how strongly... www.1st-for-dental-care.com /OPG/dental678.html   (191 words)

 Forces and Bonding: Molar Volume of a Gas The gaseous phase of matter was the last to be recognized by early scientists because most gases are invisible, and all gases require techniques of collection and handling that are not necessary with the liquid and solid phases of matter. From the measured state properties (pressure, volume, and temperature) of the gas collected, the ideal gas constant will be estimated, and the molar volume (volume occupied by one mole at T = 273 K and P = 1.00 atm) of the gas will be determined. Estimate the value of the ideal gas constant, R. Estimate the molar volume of hydrogen gas. www.wpi.edu /Academics/Depts/Chemistry/Courses/General/molarvolume.html   (573 words)

 The Ideal Gas Law   (Site not responding. Last check: 2007-11-02) According to Avogadro's law, the molar volume at a specific value of T and P is a constant, independent of the nature of the gas. For n moles of gas the ideal gas law is represented by the equation PV = nRT. The value of the molar gas constant, R, depends on the units used for pressure and volume. chemistry.twu.edu /tutorial/IdealGasLaw.html   (151 words)

 Gas Laws From this, we derive the molar volume of a gas (volume/moles of gas). Using the Ideal Gas Law, and comparing the pressure of one gas to the total pressure, we solve for the mole fraction. As we stated earlier, the shape of a gas is determined entirely by the container in which the gas is held. www.shodor.org /unchem/advanced/gas/index.html   (1034 words)

 The Ideal Gas Law   (Site not responding. Last check: 2007-11-02) The ideal gas law relates to the volume and pressure of a gas at a constant temperature. R stands for the molar gas constant which is always 0.08205 l*atm/deg*mole. The ideal gas law can be very useful when one needs to find the approximate molecular weight of a gas. www.utmem.edu /physpharm/.001b.html   (127 words)

 gas constant - a Whatis.com definition The gas constant, also known as the universal molar gas constant, is a physical constant that appears in an equation defining the behavior of a gas under theoretically ideal conditions. The gas constant is, by convention, symbolized R. The gas constant has been found, by experiment, to have a value of approximately 8.3145 joules per kelvin per mole (J · K whatis.techtarget.com /gDefinition/0,294236,sid44_gci858191,00.html   (197 words)

 Universal gas constant - Information from Reference.com The ideal gas constant occurs in the simplest equation of state, the ideal gas law, as follows: (often abbreviated k) may be used in place of the other forms of the ideal gas constant by working in pure particle count rather than number of moles of gas; this simply requires carrying a factor of Avogadro's number. For example, the equation for the speed of sound, is usually written in terms of the specific gas constant. www.reference.com /search?q=Universal+gas+constant   (457 words)

 ► Eco Kool - Human Powered Evaporative Cooling System are the molar heat capacities at constant pressure and volume, respectively (see on-line lecture notes for a derivation of this and related formulae). For an arbitrary real gas a slightly more complicated relationship between these heat capacities may be derived from the equation of state. Essentially, however, the difference between heating a gas at constant volume and constant pressure is expansion work. www.ecokool.com /adiabatic_expansion_cooling_of_gases.htm   (564 words)

 MW - The Weathers Constant The Weathers Constant, W, can be used in many areas of mathematics, economics, and computer science, and biology. Unlike some other, unwieldy physical constants, the Weathers Constant is short, easy to use, and quick to memorize. In short, the Weathers Constant is useful for many areas of science and every day life. www.matthewweathers.com /year2004/weathers_constant.htm   (359 words)

 Ideal Gas Laws and pressure of a given amount of gas is a constant. where q is a proportionality constant that depends on the quantity of gas. where n is the number of moles of gas and R the molar gas constant. www.dugantech.com /Product_Group-Moisture/Docs-HTML/Rotronic-Ideal_gas_laws.htm   (526 words)

 Definition of Molar gas constant Molar gas constant (also known as universal gas constant, usually denoted by symbol R) is the constant occurring in the universal gas equation, i.e. p \cdot V = n \cdot R \cdot T $Here p is thepressureof$gas, V the volume it occupies, n the number of moles of gas, and T its temperature. The small deviation may be because of not being an ideal gas. www.wordiq.com /definition/Molar_gas_constant   (331 words)

 Physical Constants and Conversion Factors Recently new values have been published which are considerably more accurate, except for the gravitational constant, G. For details of these please see Ref. [4] and the NIST website. Cohen and B. Taylor, "The 1986 adjustment of the fundamental physical constants", CODATA Bulletin Number 63, (1986); and Rev. Mod. The number in parenthesis after each value is the estimated standard deviation uncertainty of the last digit quoted. newton.ex.ac.uk /research/qsystems/collabs/constants.html   (160 words)

 Adiabatic Expansion Cooling of Gases From these considerations it is clear that for a monotonic gas (like He) no vibrational or rotational energy terms exist, but, like all gaseous molecules, energy may be contained in translational motion. The thermodynamic expressions used to derive the heat capacity ratio apply only to the part of the gas that remains in the carboy after the stopper is replaced since molar volumes and molar heat capacities were used. No appreciable amount of heat is transferred between the reservoir and the gas in the carboy during the short period of the expansion, but after the stopper is replaced, the temperature is seen to increase as thermal equilibrium is reestablished for the gas remaining in the vessel. itl.chem.ufl.edu /4411L_f00/gamma/gamma.html   (1528 words)

 Virtual Chemistry Experiments and Exercises   (Site not responding. Last check: 2007-11-02) The molar enthalpy of methane is determined and used to determine the standard molar enthalpy of formation of methane. A molecular-dynamics simulation of a gas is employed to explore the effect of temperature on the shape of the Maxwell distribution. A molecular-dynamics simulation of a gas is employed to explore the effect of particle mass and number of particles (in a fixed volume) on the pressure of a gas. www.chm.davidson.edu /ChemistryApplets   (3847 words)

 What is gas constant? - a definition from Whatis.com - see also: universal molar gas constant - The gas constant, also known as the universal molar gas constant, is a physical constant that appears in an equation defining the behavior of a gas under theoretically ideal conditions. The gas constant is, by convention, symbolized R. The gas constant has been found, by experiment, to have a value of approximately 8.3145 joules per kelvin per mole (J · K searchsmb.techtarget.com /sDefinition/0,,sid44_gci858191,00.html   (265 words)

 FootRule - Physical Constants However, it is not intended as a definitive list nor are any of the values guaranteed to be correct or show the correct degree of accuracy. Other sources of information on constants are listed in the External Links page. Volume occupied by one mole of an ideal gas at standard temperatureand pressure. www.footrule.com /1/science/constant.htm?sr=homepage&ac=0   (161 words)

 Constants of Physics and Mathematics The uncertainty is specified only for experimentally assessed constants and consists in the probable error in the last two digits of mantissa, enclosed in square brackets. Values as low as 50 and as high as 82 km/s/Megaparsec were found in earlier measurements but the latest one is now believed to be in error of not more than 10%. The conversion factor for parsec, taken from the current NIST database, is 3.085678e+16 m. www.ebyte.it /library/educards/constants/ConstantsOfPhysicsAndMath.html   (845 words)

 Conversion Factors, Material Properties and Physical Constants This is a short list of physical constants in SI units. This is a short list of astronomical constants in SI units. This data is derived from the 1986 CODATA recommended values of the fundamental physical constants. edboyden.org /constants.html   (212 words)

 goodcoffeeonline.com - Site units and coversion reference document - site resources avogadro grams/amu mol # size of a mole N_A avogadro gasconstant 8.314472 J / mol K # molar gas constant R gasconstant boltzmann R / N_A # Boltzmann constant k boltzmann molarvolume mol R stdtemp / atm # Volume occupied by one mole of an # ideal gas at STP. The Josephson # constant K_J, which is equal to 2e/h, relates the # measured frequency to the potential. It also directly relates to the number # of gas molecules per unit time, and hence to the mass flow if the # molecular mass is known. www.goodcoffeeonline.com /pages/units.pl?sid=4761770761   (6641 words)

 S-Cool! - AS & A2 Level Physics Revision - Quicklearn We’ve already stated that an Ideal Gas is one that perfectly obeys the Gas Laws. But in fact it was some years before it was explained that the movement was due to collisions between the pollen and millions of smaller (and therefore invisible) gas atoms. This was evidence of the continuous movement of gas atoms. www.s-cool.co.uk /topic_quicklearn.asp?loc=ql&topic_id=17&quicklearn_id=4&subject_id=2&ebt=184&ebn=&ebs=&ebl=&elc=13   (672 words)

 PHYS209        Module 4   (Site not responding. Last check: 2007-11-02) The root mean square thermal speed of molecules of mass m in a gas at temperature T is given by In this problem you can take g to be constant (why?), but the density of a gas, r, varies with pressure, and therefore with height. where m is the mass of one mole of the gas, and R is the molar gas constant = 8.314 J/K (don't confuse with radius) www.vuw.ac.nz /scps-students/phys209/modules/mod4/m4ex&pr.htm   (542 words)

 What will happen to the gas at absolute zero temperature (0 K)? The HUP states that the uncertainty of a particle's position and momentum (mass times velocity) are not independent of each other; the product of these uncertainties must be greater than a certain value. The number 'h' is called Planck's constant, and pops up throughout quantum mechanics. T, the thermodynamic temperature will be equal to 0, so the product of the molar gas constant R (8.31 J/mol/K) and the amount of moles n, will also be zero. www.physlink.com /Education/AskExperts/ae380.cfm   (418 words)

 Topic 8   (Site not responding. Last check: 2007-11-02) Helium is a good example of an ideal gas. The value of the constant depends on how much gas is being considered. If we are looking at one mole of gas (which we will define later), then the constant is the www.antonine-education.co.uk /Physics_AS/Module_2/Topic_8/topic_8.htm   (416 words)

 The laws list: I ideal gas constant; universal molar gas constant; R An equation which sums up the ideal gas laws in one simple equation, Laws, rules, principles, effects, paradoxes, limits, constants, experiments, and thought-experiments in physics. www.alcyone.com /max/physics/laws/i.html   (152 words)

 Boltzmann constant A constant that converts the temperature of a gas (K) into the kinetic energy (in joules or electron volts) associated with the thermal motion of the particles comprising the gas. It equals the molar gas constant R divided by Avogadro's constant. It is symbolized by k and has the value 1.380658 x 10 www.daviddarling.info /encyclopedia/B/Boltzmann_constant.html   (123 words)

 General Chemistry/Constants - Wikibooks, collection of open-content textbooks Constants · Standard Reduction Potentials · Table of the Chemical Elements and their Properties These constants were obtained from The NIST Reference on Constants, Units and Uncertainty. This page was last modified 22:16, 25 January 2006. en.wikibooks.org /wiki/Constants_(General_Chemistry)   (133 words)

 Constants and conversion factors The following constants and conversion factors are useful in calculations about molecular manufacturing systems and various applications of such systems. Yahoo has links to web pages of constants and units. Volume occupied by one gas molecule at STP: ~37.22 nm www.zyvex.com /nanotech/constants.html   (598 words)

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