Energy Dictionary
  • A-type

    a term for the traditional standard type of incandescent light bulb that is the most widely used artificial lighting source....
  • ab-

    ab-

    a prefix indicating electromagnetic units of the centimeter-gram-second system; e.g., abohm, abvolt....
  • abandoned

    describing an excavation that is deserted and in which no further mining is intended. Thus, abandonment, abandoned working or mine....
  • abatement

    a reduction in the amount of pollution generated, or in the effects of pollution....
  • abatement cost

    the cost of reducing emissions from some established reference level....
  • aberration

    an apparent displacement in the position of a celestial object, due to the time it takes for light from the object to reach an earthbound...
  • abiogenic

    not resulting from the activities of living organisms....
  • abiogenic theory

    the theory that hydrocarbon deposits have a (mainly) non-biological origin. According to this, such materials became trapped far below the earth's crust when the basic...
  • abiotic

    relating to or caused by nonliving environmental factors, such as light, temperature, water, soil, pH, salinity, and atmospheric gases....
  • abrasion (abrasive) drilling

    a rotary oil-drilling method in which abrasive material under pressure rotates while being pressed against the rock....
  • absolute advantage

    the ability of a country, individual, company, or region to produce more of a good or service with the same amount of resources, or the...
  • absolute entropy

    the entropy of a substance existing at a temperature of absolute zero (0 degrees Kelvin); any pure substance can be assumed to have an entropy...
  • absolute expansion

    the true expansion of a liquid with a change in temperature, allowing for the expansion of the container holding the liquid in calculating this measurement....
  • absolute humidity

    a statement of humidity that describes the mass of water vapor present in relation to the unit volume of space that it occupies; usually expressed...
  • absolute permeability

    a measurement of the ability of a fluid, such as oil, gas, or water, to flow through a rock formation when the formation is at...
  • absolute pressure

    the total pressure of a gas system measured with respect to a pure vacuum (zero pressure)....
  • absolute temperature scale

    a temperature scale whose zero point corresponds to absolute zero (see next), such as the Kelvin scale or Rankine scale. Thus, absolute temperature....
  • absolute zero

    the zero point on a temperature scale of ideal gases, denoted by 0...
  • absorb

    to take up or receive matter; undergo a process of absorption. Thus, absorbent....
  • absorbance

    the ability of a medium to absorb radiation, which depends on temperature and wavelength; expressed as the negative common logarithm of the transmittance (ratio of...
  • absorbed dose

    the amount of energy from ionizing radiation that is absorbed by a unit mass of any material; it is expressed in grays or rads. One...
  • absorber

    1. a material or device that absorbs solar radiation. 2. Photovoltaic. the material that readily absorbs photons to generate charge carriers (free electrons or holes)....
  • absorber plate

    a metal sheet in a flat plate solar collector whose primary function is to maximize the transfer of solar radiation reaching it through the glazing...
  • absorptance

    the ratio between the radiation absorbed by a surface (absorber) and the total amount of solar radiation striking the surface....