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Physical Units & Measurement Quantities

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Abstractions that define physical quantities and how they are measured or expressed — electrical and radiometric quantities (characteristic admittance, radiant intensity, inductor), ratio-based measures expressed logarithmically or geometrically (logarithmic frequency ratio, roof pitch, radiation angle), and systems for organizing units such as absolute pressure measurement.

8 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

  • Absolute Pressure Measurement — Absolute pressure sensors are used in applications where a constant reference is required, like for example, high-performance industrial applications such as monitoring vacuum pumps, liquid pressure measurement, industrial packaging, industrial process control and aviation inspection.
  • Characteristic admittance — Characteristic admittance is the mathematical inverse of the characteristic impedance.
  • Inductor — An inductor, also called a coil, choke, or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when an electric current flows through it.
  • Logarithmic frequency ratio — The logarithmic frequency ratio (also known as frequency level) of two frequencies is the logarithm of their ratio, and may be expressed using the unit octave (symbol: oct) corresponding to the ratio 2 or the unit decade (symbol: dec) corresponding to the ratio 10.
  • Radiant Intensity — In radiometry, radiant intensity is the radiant flux emitted, reflected, transmitted or received, per unit solid angle, and spectral intensity is the radiant intensity per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.
  • Radiation angle — In fiber optics, the radiation angle is half the vertex angle of the cone of light emitted at the exit face of an optical fiber.
  • Roof pitch — Roof pitch is the steepness of a roof expressed as a ratio of inch(es) rise per horizontal foot (or their metric equivalent), or as the angle in degrees its surface deviates from the horizontal.
  • System of Measurement — A system of units of measurement, also known as a system of units or system of measurement, is a collection of units of measurement and rules relating them to each other.