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Topic: Energy density

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Isadora Duncan

	Energy density - Wikipedia, the free encyclopedia
		Energy density is the amount of energy stored in a given system or region of space per unit volume or per unit mass, depending on the context.
		In Physics, "Vacuum energy" or "zero-point energy" is the volumetric energy density of empty space.
		Energy density is the amount of energy (kilojoules or calories) per milliliter of food.
	en.wikipedia.org /wiki/Energy_density (810 words)

	Energy Density -- from Eric Weisstein's World of Physics
		Energy density is the amount of energy stored in a given system or region of space per unit volume, and is most commonly denoted u.
		The energy density of an electromagnetic field is given in cgs by
		The energy density of an ideal gas is given by
	scienceworld.wolfram.com /physics/EnergyDensity.html (190 words)

	Pressure
		For example, the energy density of solvent molecules which leads to osmosis is expressed as osmotic pressure.
		When the kinetic energy is that of fluid under conditions of laminar flow through a tube, one must take into account the velocity profile to evaluate the kinetic energy.
		The energy density of a fluid can be expressed in terms of this potential energy density along with kinetic energy density and fluid pressure.
	hyperphysics.phy-astr.gsu.edu /hbase/press.html (528 words)

	Energy Density
		It was discovered that when given lower energy dense foods rather than lower fat foods, the subjects reduced their total energy intake even though they had quite a bit of leeway in regards to snacks.
		The study concluded that reducing the energy density of the diet may contribute to a significant reduction in energy intake, thus facilitating weight loss.
		Energy density but not fat content of foods affected energy intakes in lean and obese women.
	www.healthyeatingclub.com /info/articles/body-shape/energy-density.htm (554 words)

	Vacuum Energy Density (Site not responding. Last check: 2007-10-20)
		On the assumption that the vacuum energy density would be formally zero in a flat universe, an attempt is made here to calculate the value for a slightly curved universe.
		The energy density of the resonant modes is calculated and then the walls of the box in the y and z dimensions are allowed to go to infinity while x is set to a, the width of the cavity.
		Since the lower limit of the resonant photon wavelength in the cavity is 0, the energy density is infinite.
	alsystems.algroup.co.uk /casimir/VED2.html (1820 words)

	Energy Density and Nutrition in Weight Control Management
		The energy density for this category is between 0.6 and 1.5 kcal/g.
		The energy density of foods in the third category ranges from 1.5 to 4.0 kcal/g and includes a wide variety of foods, such as cheese, salad dressings, some snack foods, and desserts.
		Energy density of foods affects energy intake across multiple levels of fat content in lean and obese women.
	xnet.kp.org /permanentejournal/spring03/energy.html (2180 words)

	Peak sugar! \| EnergyBulletin.net \| Peak Oil News Clearinghouse
		energy) in the same way we do with a spring trap or crossbow; we spend N minutes winding the thing up and then all that invested energy is released in N/X minutes where X is a very big number.
		The private auto, the jet aircraft, and the planing heavy vessel are the ultimate worst case for fuelling, because they require high energy density (high burn rate), which is the costliest thing to achieve in a fuel.
		If we now try to produce this same energy density or burn rate using immediate biotic sources, we run into a little problem -- a time travel problem as it were: a normal growing season doesn't deposit that much energy in a vegetable crop.
	www.energybulletin.net /14571.html (1821 words)

	Energy -- from Eric Weisstein's World of Physics
		Energy is an abstract quantity of extreme usefulness in physics because it is defined in such a way that the total energy of any closed physical system is always constant (conservation of energy).
		Energy is measured in units of mass times velocity squared, and the MKS and cgs units of energy are the Joule and erg, respectively.
		In fact, the notion that heat is a form of energy was one of the most important developments in classical physics and thermodynamics.
	scienceworld.wolfram.com /physics/Energy.html (364 words)

	Electrostatic Energy and Force (Site not responding. Last check: 2007-10-20)
		Electrostatic energy W of a point charge is the work done by the force on the charge q when it moves from position a to position b.
		Electrostatic energy is path independent due to the principle of conservation of energy as shown in figure 1.1.
		The electrostatic energy of the group of point charges, which are infinitely separated from each other, can be obtained by calculating the work to assemble the charges, bringing in one at a time.
	www.pages.drexel.edu /~zt27/energy.htm (954 words)

	NPR : Jonesing for Fries? Blame the Cave Men
		Calculating Energy Density: To calculate the energy density of foods, divide the calories in one serving by its weight in grams.
		Foods with an energy density of 1 to 2 -- such as beans, fish, fat-free, skinless chicken and rice -- are also good to eat.
		You can lower its calorie or energy density not only by using less cheese and reduced-fat milk, but by bulking the casserole up with other foods such as vegetables, which are packed with water and fiber but not calories.
	www.npr.org /templates/story/story.php?storyId=4618562 (755 words)

	vacuum
		So, when you ask about the energy density of the vacuum, you get different answers depending on whether the person answering you is basing their answer on general relativity or quantum field theory.
		However, the basic fact that the energy density of spacetime is very close to zero is almost unarguable: for it to be false, general relativity would have to be very wrong.
		For a calculation that explains why the vacuum having positive energy density means it has enough negative pressure to make the expansion of the universe accelerate, see the cosmological constant section of my website about the meaning of Einstein's equation.
	math.ucr.edu /home/baez/vacuum.html (1449 words)

	Sound energy density - Wikipedia, the free encyclopedia
		The sound energy density or sound density (symbol E or w) is an adequate measure to describe the sound field at a given point as a sound energy value.
		In opposite to the sound intensity I, which gives the sound energy per area A, the sound energy density E (also: sound density) describes the time medium value of the sound energy per volume unit; it gives information about the sound energy which is at a defined place in the room.
		In speaking of average energy density, it is necessary to distinguish between the space average (at a given instant) and the time average (at a given point).
	en.wikipedia.org /wiki/Sound_energy_density (306 words)

	Lecture X. (Site not responding. Last check: 2007-10-20)
		Energy storage is also important for power leveling for the power companies --> Generating stations operate more efficiently if they run at constant output level --> want to shove unused energy to a storage system
		Energy storage must consider both the amount of energy that can be stored (energy density of the material) and the efficiency at which it can be recovered
		Higher energy density of gasoline quickly dominated the way vehicles were propelled.
	zebu.uoregon.edu /ph162/l10.html (494 words)

	Gravity Theory -- Introducing Energy-Density Component
		Currently, many hundreds of millions of dollars have been spent, and hundreds of millions are now being sought, by an international university and investigative consortium in order to continue their research into gravity waves and to unravel the mysteries of gravity.
		First, two bodies of some energy density to interact with each other, and second, connecting diallel lines which provide not only particle flow between the bodies, but also the flow of photon and gravitational information as well.
		In summary then, the conditions needed for the gravitational field are two objects with some energy density (not just mass) and with diallel lines running between these two energy-density objects, which diallel lines are conducting particles, i.e.
	www.allanstime.com /UnifiedFieldTheory/gravity.htm (1715 words)

	Energy Density in Torndoes
		Tornadoes are so destructive because they have a higher energy density than thunderstorms; the energy is concentrated in a small area while the energy in a thunderstorm is spread-out over a much greater area.
		Energy and energy density can be compared to weight and force.
		Energy density is energy per unit volume and force is weight per unit area.
	www.windows.ucar.edu /tour/link=/earth/Atmosphere/tornado/density.html&edu=high (243 words)

	Vacuum energy density and Hubble expansion
		The possibility that the negative energy of gravity could balance the positive energy for the matter of the Universe was suggested as early as 1932 by Richard Tolman, although a viable mechanism for the energy transfer was not known.
		This borrowing of energy from the gravitational field gives the inflationary paradigm an entirely different perspective from the classical Big Bang theory, in which all the particles in the Universe (or at least their precursors) were assumed to be in place from the start.
		B. The compensation is not done by the gravitational potential of the masses in the universe, but may be the vacuum energy itself produces a gravitational potential which compensates its energy density (may be this is senseless).
	www.physicsforums.com /showthread.php?p=112186 (1929 words)

	Energy Density Field Theory
		The energy density and the potential are part of the fundermental nature of the electric field.
		We use the symbol Q for energy density and suffix it to denote a particular form of energy density.
		Now since energy densities are scalar quantities, we obtain only the magnitudes of the electric intensity and the magnetic induction from these equations.
	users.powernet.co.uk /bearsoft/Field.html (1660 words)

	Food Energy Density Plays A Role In Feeling Full
		Previously, researchers believed that fat played a role in feelings of satiety or fullness, but the new study suggests that low food "energy density" is actually the key, according to a team of nutritionists at Pennsylvania State University in University Park.
		Low-energy density meals tend to have fewer calories per ounce and contain more fruits, vegetables and grains than high-energy density meals, researchers explained in the May issue of the American Journal of Clinical Nutrition.
		When women consumed the low-fat, low-energy density meals, they tended to eat less of the side dishes because they felt full and satisfied after the meal, the investigators report.
	www.personalmd.com /news/a1999060206.shtml (418 words)

	Cosmological Constant
		This term acts like a vacuum energy density, an idea which has become quite fashionable in high energy particle physics models since a vacuum energy density of a specific kind is used in the Higgs mechanism for spontaneous symmetry breaking.
		The vacuum energy density must be constant because there is nothing for it to depend on.
		One way to look for a vacuum energy density is to study the orbits of particles moving in the gravitational field of known masses.
	www.astro.ucla.edu /~wright/cosmo_constant.html (2264 words)

	Penn State News
		However, the number of calories per ounce of food, or energy density, was changed on each day by varying the amount of apples in the apple bake crisp and the vegetables in the other meals to create low, medium and high energy density meals.
		Twenty of the women were given an energy density training session and a quiz that showed that they understood the concepts.
		These same women were given their meals with a label that said whether the main entrée was low, medium or high in energy density, the actual value of energy density and the weight and calories per serving.
	www.psu.edu /ur/2002/overeating.html (587 words)

	Technology Advantages - Millennium Cell - The Hydrogen Battery Technology Company
		One of the most important attributes by which battery chemistry is compared is energy density, which simply means the amount of energy in watt-hours (Wh) packaged per unit weight (kg) and unit volume (L).
		This higher energy density is primarily derived from the high theoretical energy density of the fuels being considered for the fuel cell.
		Clearly, the theoretical energy density of the fuels shown in Table 2 are an order of magnitude higher than the energy density of existing battery technologies shown in Table 1.
	www.millenniumcell.com /fw/main/Technology_Advantages-28.html (1013 words)

	Magnetized Target Fusion
		The liner velocity required is termed hypervelocity because the kinetic energy density exceeds the heat of vaporization for liner materials.
		In what must be viewed as a serendipitous coincidence, the Department of Energy's Office of Defense Programs (DP) in the last decade has significantly advanced the technology of imploding liners with the same parameters of implosion velocity and kinetic energy as those needed for investigating fusion reactions in the MTF regime.
		(same as thermal conductivity divided by density) is derived by calculating the energy flux in the presence of a temperature gradient.
	fusionenergy.lanl.gov /Documents/MTF/Why_MTF/Why-MTF-Comments.html (6674 words)

	Chemical Potential Energy
		When comparing fuels, it's often more instructive to speak of their energy density rather than their energy.
		The energy content of foods is no longer measured directly much anymore.
		These numbers are then multiplied by the respective energy densities.
	hypertextbook.com /physics/matter/energy-chemical (273 words)

	Energy Density of Foods :: Provided by MyFoodDiary.com
		This concept of energy density, also known as caloric density of foods, can be defined as "the number of calories in a given weight of food".
		She has recommended that a large portion of our food choices should have energy densities of less than 1 (i.e., fresh fruits, vegetables, low-fat dairy) or 2 (i.e., beans, fish, poultry, etc.), and that food choices above an energy density of 2 (i.e., oils, desserts, french fries, etc.) should be used sparingly.
		She also holds a second M.S. degree in Nutrition and is a licensed nutritionist and an ACSM certified health and fitness instructor.
	www.myfooddiary.com /resources/ask_the_expert/energy_density_foods.asp (514 words)

	Energy density is the key to healthy, high-volume eating
		Energy density is the key to healthy, high-volume eating
		It may sound like weird science, but "energy density" is nothing more than the calories in a portion of food.
		Choosing foods that are high in water and fiber and low in density allows dieters to enjoy larger, more satisfying portions, and to lose weight without feeling hungry.
	onhealth.webmd.com /script/main/art.asp?articlekey=55879 (840 words)

	The Tom Bearden Website (Site not responding. Last check: 2007-10-20)
		The energy density of the vacuum potential is enormous, even mind-boggling.
		While scientists have estimated that energy by various means, a reasonable calculation is given by Wheeler and Misner in their Geometrodynamics.
		The energy density of the vacuum is appreciably greater than what physicists normally calculate, because they do not calculate the additional time-energy density portion of the vacuum stress.
	www.cheniere.org /references/energydensityofvacuum.htm (370 words)

	Gravitational Pull Effected by Energy Density Variation
		In the new theory, gravitational attraction is dependent upon the energy density of the objects involved.
		The new theory shows that these diallel lines can be modified and/or bent due to energy densities that may be present along the path between the two objects.
		The three energy density sources were chemical, electrostatic and magnetic.
	www.allanstime.com /Research/Pendulum/index.html (559 words)

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