# Eq

**Equal Loudness Contour**- A contour representing a constant loudness for all audible frequencies.
**Equality**- The relationship between two quantities that have the same value or values.
**Equalization**- The process of adjusting the frequency response of a device or system to achieve a flat or other desired response.
**Equalizer**- A device for adjusting the frequency response of a device or system.
**Equally Likely**- In probability, when there are the same chances for more than one event to happen, the events are equally likely to occur.
**Equation**- A statement that two expressions are equal to each other.
**Equations of Motion**- There are four basic equations that describe the motion of a body moving with constant acceleration.
**Equations of Rotational Motion**- The rotational forms of the equations describing a body undergoing constant angular acceleration.
**Equatorial Axis**- Among the two mutually perpendicular axes of a telescope, the one that points at the celestial pole.
**Equatorial Orbit**- An orbit that occurs when the plane of a satellite coincides with the plane of the earth at the equator.
**Equiangular Polygon**- A polygon all of whose interior angles are equal.
**Equiaxed**- Powder or grain shapes with approximately equal dimensions.
**Equichordal Point**- A point inside a closed convex curve in the plane is called an equichordal point if all chords through that point have the same length.
**Equidistant**- The same distance from something.
**Equilateral**- Equal in length.
**Equilateral Polygon**- A polygon all of whose sides are equal.
**Equilateral Triangle**- A triangle with three equal sides.
**Equilibrium**- In mechanics a body may be in one of three states of equilibrium: stable, unstable and neutral. In chemistry when the reactants and products are in a constant ratio. The forward reaction and the reverse reactions occur at the same rate when a system is in equilibrium.
**Equilibrium Constant**- Value that expresses how far the reaction proceeds before reaching equilibrium.
**Equilibrium Expressions**- The expression giving the ratio between the products and reactants.
**Equinox**- The two times of the year when the sun crosses the equator and night and day are of equal length; usually occurs on March 21st (spring equinox) and September 23rd (autumn equinox).
**Equivalence Point**- Occurs when the moles of acid equal the moles of base in a solution.
**Equivalence Principle**- Constant acceleration is completely equivalent to a uniform gravitational field.
**Equivalence Ratio**- Actual air/fuel ratio divided by the air/fuel ratio at stoichiometry.
**Equivalent Carbon Dioxide**- The amount of carbon dioxide that would cause the same integrated radiative emission as the emitted amount of greenhouse gases.
**Equivalent Continuous Sound Level**- There are a number of different noise criteria measurements used by local authorities to determine noise levels in the community.
**Equivalent Linear Systems**- Two systems of linear equations in n unknowns are equivalent if they have the same set of solutions.
**Equivalent Lithium Content**- An estimation of the amount of lithium in a lithium-ion battery based on the Ah or Wh capacity.
**Equivalent Rectangular Bandwidth**- This is the effective bandwidth of an auditory filter.
**Equivalent Resistance**- A resistance that represents the total ohmic values of a circuit component or group of circuit components.
**Equivalent Spherical Diameter**- The diameter of a sphere of the same volume as the object being described.
**Equivalent Spherical Radius**- The radius of a sphere of the same volume as the object being described.