Pressure ... It is incorrect (although rather usual) to say "the pressure is directed in such or such direction". The pressure, as a scalar, has no direction...
Real Gas ... Where P is the pressure, T is the temperature, R the ideal gas constant, and Vm the molar volume. a and b are parameters that are determined empirically for each gas, but are sometimes estimated from their critical temperature (Tc) and critical pressure (Pc) using these relations:...
Charles's Law ... His statement of the law can be expressed mathematically as: where V100 is the volume occupied by a given sample of gas at 100 °C; V0 is the volume occupied by the same sample of gas at 0 °C; and k is a constant which is the same for all gases at constant pressure...
MOX Fuel ... One attraction of MOX fuel is that it is a way of utilizing surplus weapons-grade plutonium, an alternative to storage of surplus plutonium, which would need to be secured against the risk of theft for use in nuclear weapons. On the other hand, some studies warned that normalising the global commercial use of MOX fuel and the associated expansion of nuclear reprocessing will increase, rather than reduce, the risk of nuclear proliferation, by encouraging increased separation of plutonium from spent fuel in the civil nuclear fuel cycle...
Fossil Fuel ... It was estimated by the Energy Information Administration that in 2007 primary sources of energy consisted of petroleum 36.0%, coal 27.4%, natural gas 23.0%, amounting to an 86.4% share for fossil fuels in primary energy consumption in the world...
History Of The Automobile ... The first automobile patent in the United States was granted to Oliver Evans in 1789. 19th century Among other efforts, in 1815, a professor at Prague Polytechnich, Josef Bozek, built an oil-fired steam car...
Perfect Gas ... A thermally perfect gas is in thermodynamic equilibrium is not chemically reacting has internal energy e, enthalpy h, and specific heat Cv that are functions of temperature only and not of pressure, i.e., ... This type of approximation is useful for modeling, for example, an axial compressor where temperature fluctuations are usually not large enough to cause any significant deviations from the thermally perfect gas model... Even more restricted is the calorically perfect gas for which, in addition, the specific heat is assumed to be constant: and ...
Behavior Of Nuclear Fuel During A Reactor Accident ... According to one paper the following difference between the cladding failure mode of unused and used fuel was seen. Unirradiated fuel rods were pressurized before being placed in a special reactor at the Japanese Nuclear Safety Research Reactor (NSRR) where they were subjected to a simulated RIA transient...
Automobile ... The term motorcar has also been used in the context of electrified rail systems to denote a car which functions as a small locomotive but also provides space for passengers and baggage. These locomotive cars were often used on suburban routes by both interurban and intercity railroad systems...
Effects Of The Automobile On Societies ... The effects of the automobile on everyday life have been a subject of controversy. While the introduction of the mass-produced automobile represented a revolution in mobility and convenience, the modern consequences of heavy automotive use contribute to the use of non-renewable fuels, a dramatic increase in the rate of accidental death, social isolation, the disconnection of community, the rise in obesity, the generation of air & noise pollution, urban sprawl, and urban decay...
Equation Of State ... The pressure of the gas could be determined by the difference between the mercury level in the short end of the tube and that in the long, open end... Mathematically, this can be represented for n species as: The ideal gas law (1834) In 1834 Émile Clapeyron combined Boyle's Law and Charles' law into the first statement of the ideal gas law... Initially the law was formulated as pVm = R (TC + 267) (with temperature expressed in degrees Celsius), where R is the gas constant...
Gas ... High-density atomic gases super cooled to incredibly low temperatures are classified by their statistical behavior as either a Bose gas or a Fermi gas... Their detailed studies ultimately led to a mathematical relationship among these properties expressed by the ideal gas law (see simplified models section below)... Gas particles are widely separated from one another, and as such are not as strongly intermolecularly bonded to the same degree as liquids or solids...
Kinetic Theory ... While the particles making up a gas are too small to be visible, the jittering motion of pollen grains or dust particles which can be seen under a microscope, known as Brownian motion, results directly from collisions between the particle and gas molecules... Postulates The theory for ideal gases makes the following assumptions: The gas consists of very small particles... This smallness of their size is such that the total volume of the individual gas molecules added up is negligible compared to the volume of the container...
Alternative Fuel Vehicle ... 14.7 million natural gas vehicles by December 2011, led by Iran with 2.86 million, Pakistan (2.85 million), Argentina (2.04 million), Brazil (1.7 million), and India (1.1 million)...
Turbulence ... Irregularity: Turbulent flows are always highly irregular. This is why turbulence problems are always treated statistically rather than deterministically...
Fuel ... Perhaps the earliest fuel employed by humans is wood. Evidence shows controlled fire was used up to 1.5 million years ago at Swartkrans, South Africa...
Thermodynamic Temperature ... At its simplest, temperature arises from the kinetic energy of the vibrational motions of matter's particle constituents (molecules, atoms, and subatomic particles). The full variety of these kinetic motions, along with potential energies of particles, and also occasionally certain other types of particle energy in equilibrium with these, contribute the total thermal energy (loosely, the heat energy) within a substance...
Gasification ... Syngas may be burned directly in gas engines, used to produce methanol and hydrogen, or converted via the Fischer-Tropsch process into synthetic fuel... In addition, the high-temperature process refines out corrosive ash elements such as chloride and potassium, allowing clean gas production from otherwise problematic fuels... Initially developed to produce town gas for lighting & cooking in 1800s, this was replaced by electricity and natural gas, it was also used in blast furnaces but the bigger role was played in the production of synthetic chemicals where it has been in use since the 1920s...
Thermodynamic Equilibrium ... Thermodynamics Branches Classical · Statistical · Chemical Equilibrium / Non-equilibrium Thermofluids Laws Zeroth · First · Second · Third Systems State: Equation of state Ideal gas · Real gas Phase of matter · Equilibrium Control volume · Instruments Processes: Isobaric · Isochoric · Isothermal Adiabatic · Isentropic · Isenthalpic Quasistatic · Polytropic Free expansion Reversibility · Irreversibility Endoreversibility Cycles: Heat engines · Heat pumps Thermal efficiency System properties Property diagrams Intensive and extensive properties State functions: Temperature / Entropy (intro.) † Pressure / Volume † Chemical potential / Particle no... † († Conjugate variables) Vapor quality Reduced properties Process functions: Work · Heat Material properties Specific heat capacity Compressibility Thermal expansion...
Van Der Waals Force ... All intermolecular/van der Waals forces are anisotropic (except those between two noble gas atoms), which means that they depend on the relative orientation of the molecules... When molecules are in thermal motion, as they are in the gas and liquid phase, the electrostatic force is averaged out to a large extent, because the molecules thermally rotate and thus probe both repulsive and attractive parts of the electrostatic force...
Statistical Mechanics ... Statistical mechanics was initiated in 1870 with the work of Austrian physicist Ludwig Boltzmann, much of which was collectively published in Boltzmann's 1896 Lectures on Gas Theory...
Density ... Less dense fluids float on more dense fluids if they do not mix. This concept can be extended, with some care, to less dense solids floating on more dense fluids...
Avogadro's Law ... Thus, the number of molecules or atoms in a specific volume of gas is independent of their size or the molar mass of the gas... As an example, equal volumes of molecular hydrogen and nitrogen contain the same number of molecules when they are at the same temperature and pressure, and observe ideal gas behavior... Mathematical definition Avogadro's law is stated mathematically as: Where: V is the volume of the gas...
Future Car Technologies ... With rising gas prices, the future of the automobile is now leaning towards fuel efficiency, energy-savers, hybrid vehicles, battery electric vehicles, and fuel-cell vehicles...
Brownian Motion ... In 1827 the biologist Robert Brown noticed that if you looked at pollen grains in water through a microscope, the pollen jiggles about. He called this jiggling 'Brownian motion', but Brown couldn't work out what was causing it...
Further Reading: Fuel
Hubbert Peak Theory ... Choosing a particular curve determines a point of maximum production based on discovery rates, production rates and cumulative production. Early in the curve (pre-peak), the production rate increases because of the discovery rate and the addition of infrastructure...
Peak Oil ... This concept is based on the observed production rates of individual oil wells, projected reserves and the combined production rate of a field of related oil wells. In order to understand physical Peak oil, the growing effort for production must be considered...
Biofuels By Region ... A senior member of the House Energy and Commerce Committee, Congressman Fred Upton introduced legislation to use at least E10 fuel by 2012 in all cars in the USA... Federal subsidies alone cost $7 billion a year (equal to around $1.90 a gallon)." General Motors is starting a project to produce E85 fuel from cellulose ethanol for a projected cost of $1 a gallon... GM has over 4 million E85 cars on the road now, and by 2012 half of the production cars for the US will be capable of running on E85 fuel...
Biodiesel ... Biodiesel is meant to be used in standard diesel engines and is thus distinct from the vegetable and waste oils used to fuel converted diesel engines... Blends Blends of biodiesel and conventional hydrocarbon-based diesel are products most commonly distributed for use in the retail diesel fuel marketplace... Much of the world uses a system known as the "B" factor to state the amount of biodiesel in any fuel mix: 100% biodiesel is referred to as B100, while 20% biodiesel, 80% petrodiesel is labeled B20 5% biodiesel, 95% petrodiesel is labeled B5 2% biodiesel, 98% petrodiesel is labeled B2...
Economics Of Automobile Usage ... One general benefit is availability of use which, when coupled with public support via infrastructure (such as roads or fuel stations), can allow highly flexible movement and transportation...
Alcohol Fuel ... Methanol and ethanol Main articles: Methanol fuel, Ethanol fuel Methanol and ethanol can both be derived from fossil fuels, biomass, or perhaps most simply, from carbon dioxide and water... As a fuel, methanol and ethanol both have advantages and disadvantages over fuels such as petrol (gasoline) and diesel fuel... As a compression ignition engine fuel, both alcohols create very little particulates, but their low cetane number means that an ignition improver like glycol must be mixed into the fuel with approx...
Automotive Market In The United States ... With the high fuel prices and the world petroleum crisis, the United States has seen its automotive market become more like the European market with fewer large vehicles on the road and more small cars...
Biogas ... In the UK, for example, biogas is estimated to have the potential to replace around 17% of vehicle fuel...
Vegetable Oil Fuel ... In the 1990s Bougainville conflict, islanders cut off from oil supplies due to a blockade used coconut oil to fuel their vehicles... Application and usability While engineers and enthusiasts have been experimenting with using vegetable oils as fuel for a diesel engine since at least 1900, it is only recently that the necessary fuel properties and engine parameters for reliable operation have become apparent... Modified fuel systems Most diesel car engines are suitable for the use of SVO, also commonly called pure plant oil (PPO), with suitable modifications...
Automobile Safety ... Improvements in roadway and automobile designs have steadily reduced injury and death rates in all first world countries. Nevertheless, auto collisions are the leading cause of injury-related deaths, an estimated total of 1.2 million in 2004, or 25% of the total from all causes...
Road Traffic Safety ... The standard measures used in assessing road safety interventions are fatalities and Killed or Seriously Injured (KSI) rates, usually per billion (109) passenger kilometres. Countries caught in the old road safety paradigm, replace KSI rates with crash rates - for example, crashes per million vehicle miles...
Aneutronic Fusion ... However, the conditions required to harness aneutronic fusion are much more extreme than those required for the conventional deuterium–tritium (DT) fuel cycle... Although these can be minimized by running hot and deuterium-lean, the fraction of energy released as neutrons will probably be several percent, so that these fuel cycles, although neutron-poor, do not qualify as aneutronic according to the 1% threshold...
Automotive Industry ... The term automotive industry usually does not include industries dedicated to automobiles after delivery to the customer, such as repair shops and motor fuel filling stations...
Attribution Of Recent Climate Change ... Attribution of recent change to anthropogenic forcing is based on the following facts: The observed change is not consistent with natural variability. Known natural forcings would, if anything, be negative over this period...
Automotive Industry In Iran ... As of 2001, there were 13 public and privately owned automakers in Iran, of which two - Iran Khodro and Saipa - accounted for 94% of the total domestic production. Iran Khodro, which produced the most prevalent car brand in the country - the Paykan, which has been replaced in 2005 by the Samand -, was still the larger with 61% of the market in 2001, while Saipa contributed 33% of Iran’s total production in the same year...
Uranium Nitride ... Uranium mononitride was used as driver fuel for two core loads of the sodium cooled BR-10 reactor in Russia... The property which makes uranium mononitride highly attractive as a nuclear fuel is the combination of a high melting temperature with high thermal conductivity... Increased thermal conductivity results in lower thermal gradients between inner and outer sections of the fuel, potentially allowing for higher operating temperatures and reducing macroscopic restructuring of the fuel, which limits fuel lifetime...
Spent Nuclear Fuel ... A paper describing a method of making a non-radioactive "uranium active" simulation of spent oxide fuel exists...
Decay Heat ... Decay heat occurs naturally from decay of long-lived radioisotopes that are primordially present from the Earth's beginning. In nuclear reactor engineering, decay heat plays an important role in reactor heat generation during the relatively short time after the reactor has been shut down (see SCRAM), and nuclear chain reactions have been suspended...
Uranium Carbide ... Like uranium dioxide and some other uranium compounds, uranium carbide can be used as a nuclear fuel for nuclear reactors, usually in the form of pellets or tablets... Uranium carbide pellets are used as fuel kernels for the US version of pebble bed reactors; the German version uses uranium dioxide instead...
Biodiesel By Region ... Australia The Fuel Standard (Biodiesel) Determination 2003 was signed by the Minister for the Environment and Heritage on 18 September 2006...
Environmental Impact Of The Energy Industry ... In the real world, consumption of fossil fuel resources lead to global warming and climate change. However in many parts of the world little change is being made...
Vegetable Oil Refining ... Refined diesel can be produced that is chemically identical to diesel fuel and does not have the problems specific to transesterified biodiesel... Petrobras planned to use 256 megalitres (1,610,000 bbl) of vegetable oils in the production of H-Bio fuel in 2007...