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  Encyclopedia of Keywords > Information > Science > Physics > Length   Michael Charnine

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    This Review contains major "Length"- related terms, short phrases and links grouped together in the form of Encyclopedia article.


  1. Length is the long dimension of any object.
  2. Length is the metric of one dimension of space.
  3. Length is a physical quantity that can be divided as small as you would like, with no practical limit.
  4. Length is the measure of distances in space.
  5. In the physical sciences and engineering, the word "length" is typically used synonymously with "distance".


  1. The relevant parts of Planck's 1899 paper leave some confusion as to how he managed to come up with the units of time, length, mass, temperature etc.
  2. The original base units of the metric system could be derived from the length of a meridian of the Earth and the weight of a certain volume of pure water.
  3. Multiply them times an imperial length # units as desired.
  4. Since R is measured in units of length and neither pi nor theta have associated units, the net result of this computation is measured in units of length.


  1. For example, the mass of a rat and the mass of a flea may be added, but the mass of a flea and the length of a rat cannot be meaningfully added.
  2. For example, a measurement of the length of a plank might result in a measurement of 2.53 meters plus or minus 0.01 meter, with a probability of 99%.
  3. For example, rather than an undifferentiated length unit L, we may have L x represent length in the x direction, and so forth.
  4. There is a two-dimensional analog of pressure -- the lateral force per unit length applied on a line perpendicular to the force.
  5. The ratio (length divided by length) is dimensionless.

Physical Quantity

  1. There are also physical quantities that can be classified as neither extensive nor intensive, for example angular momentum, area, force, length, and time.
  2. The dimensions of a physical quantity are associated with mass, length, and time, represented by symbols M, L, and T each raised to rational powers.

Focal Length

  1. Rotating the zoom ring adjusts the focal length.
  2. Principle focus  : This value is related to the focal length of the lens.


  1. If the object distance is smaller than the focal length of this lens, the image is virtual, erect, and larger than the object.
  2. Usually found on the barrel of a lens, f-numbers indicate the size of the aperture in relation to the focal length of the lens.
  3. A lens with a shorter focal length would cause the angle subtended by the virtual image to increase and thus cause the magnifying power to increase.
  4. FL - Focusing Lens is a short focal length convex lens.


  1. When using the unit of " radians " the length that is compared is the length of the radius of the circle.
  2. The focal length of a spherical mirror is equal to half the radius of curvature.


  1. In words, this equation says that the force per unit length of wire is the cross product of the current vector and the magnetic field.
  2. The length of the arrow represents the vector's magnitude, while the direction in which the arrow points represents the vector's direction.
  3. For polarized light the end of the vector lies on the surface of the sphere, whereas the vector has zero length for unpolarized light.


  1. Regular hexagon s is the length of one side of the hexagon.
  2. Regular octagon s is the length of one side of the octagon.
  3. Regular triangle s is the length of one side of the triangle.


  1. The magnification is the focal length of the telescope divided by the focal length of the eyepiece.
  2. Because the index of refraction varies with wavelength, the focal length of a lens also varies and causes longitudinal or axial chromatic aberration.
  3. For a given scene and subject magnification, the background blur increases with lens focal length.


  1. But in the case of, say, an 80mm lens, we’re talking about its focal length.
  2. On 35mm cameras, full frame fisheyes usually have a focal length of 8mm, and semi-fisheyes have a focal length of 15mm or 16mm.
  3. By convention a normal lens on a 35mm film camera (and thus a full-frame EOS digital SLR) has a focal length of 50mm or so.

Coherence Length

  1. The coherence length (or coherence time) are unchanged by the pinhole.
  2. Figure 9: The wave with infinite coherence length from Figure 6 is combined with a spatially shifted copy of itself.
  3. Thus, a highly coherent source that gives off light with no phase change will produce a long wave train and will be characterized by a long coherence length.
  4. The coherence length L c is defined as the distance the wave travels in time τ c.
  5. The Michelson interferometer measures coherence length of light sources directly.


  1. Rectangle l and w are the lengths of the rectangle's sides (length and width).
  2. Look up length, width, breadth in Wiktionary, the free dictionary.


  1. A measure of spatial extent, especially width, height, or length.
  2. Last check: 2007-10-08) The spatial coherence length is determined by the cavity and cavity reflectivity in a laser.


  1. Parallelogram (in general) b and h are the length of the base and the length of the perpendicular height, respectively.
  2. They are the fundamental quantities, which include length, mass and time.
  3. Thus, Huntley's L x becomes with L specifying the dimension of length, and 1 x specifying the orientation.
  4. The semi-minor axis of an ellipse (a flattened circle) is half the length of the line segment across the shortest part of the ellipse.


  1. Encyclopedia of Keywords > Information > Science > Physics
  2. Encyclopedia of Keywords > Nature
  3. Glossaries > Glossary of Physical Quantity /


Astronomical Unit
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  Short phrases about "Length"
  Originally created: June 24, 2008.
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