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Measurable property of a material or system
A physical quantity (or simply quantity) is a property of a material or system that can be quantified by measurement. A physical quantity can be expressed
Physical_quantity
This article consists of tables outlining a number of physical quantities. A physical quantity is a property of a material or system that can be quantified
List_of_physical_quantities
Analysis of the dimensions of different physical quantities
science, dimensional analysis of different physical quantities is the analysis of their physical dimension or quantity dimension, defined as a mathematical
Dimensional_analysis
Property of magnitude or multitude
many), the two principal types of quantities, are further divided as mathematical and physical. In formal terms, quantities—their ratios, proportions, order
Quantity
System of quantities used in science and their interrelationships
revised and expanded. The base quantities of a given system of physical quantities form a subset in which no base quantity can be expressed in terms of
International System of Quantities
International_System_of_Quantities
Physical quantity that is a vector
sciences, a vector quantity (also known as a vector physical quantity, physical vector, or simply vector) is a vector-valued physical quantity. It is typically
Vector_quantity
Properties independent of system size, and proportional to system size
extensive property is a physical quantity whose value is proportional to the size of the system it describes, or to the quantity of matter in the system
Intensive and extensive properties
Intensive_and_extensive_properties
Quantity standard
a multiple of the unit of measurement, For example, a length is a physical quantity. The metre (symbol: m) is a unit of length that represents a definite
Unit_of_measurement
Universal and unchanging physical quantity
A physical constant, sometimes called a fundamental physical constant or universal constant, is a physical quantity that cannot be explained by a theory
Physical_constant
Attribute of a physical system or body or non-chemical property of a material
quantifiable physical property is called physical quantity. Measurable physical quantities are often referred to as observables. Some physical properties
Physical_property
One-dimensional physical quantity
Scalar quantities or simply scalars are physical quantities that can be described by a single pure number (a scalar, typically a real number), accompanied
Scalar_(physics)
Broad concept generalizing scalars in mathematics and physics
number. It may denote a vector quantity, i.e., physical quantity that cannot be expressed by a single scalar quantity. The term may also be used to refer
Vector (mathematics and physics)
Vector_(mathematics_and_physics)
Physical quantities taking values at each point in space and time
In science, a field or field quantity is a physical quantity – represented by a scalar, vector, spinor, or tensor – that has a value for each point in
Field_(physics)
Any entity that can be measured
In physics, an observable is a physical property or physical quantity that can be measured. In classical mechanics, an observable is a real-valued "function"
Observable
Derived SI unit of equivalent dose of ionizing radiation
To calculate the value of stochastic health risk in sieverts, the physical quantity absorbed dose is converted into equivalent dose and effective dose
Sievert
Mass per unit volume
generalized in the International System of Quantities to volumic quantities, the quotient of any physical quantity and volume, such as charge density or volumic
Density
Concept relating to waves and signals
axis) Spectrogram of dolphin vocalizations In the physical sciences, the spectrum of a physical quantity (such as energy) may be called continuous if it
Spectrum_(physical_sciences)
Varying physical quantity that conveys information
processing, signals are analog and digital representations of analog physical quantities. In information theory, a signal is a codified message, that is,
Signal
Time rate of change of some physical quantity of a material element in a velocity field
the material derivative describes the time rate of change of some physical quantity (like heat or momentum) of a material element that is subjected to
Material_derivative
Physical quantity that expresses internal forces in a continuous material
In continuum mechanics, stress is a physical quantity that describes forces present during deformation. For example, an object being pulled apart, such
Stress_(mechanics)
Product of a distance and physical quantity
a physical quantity such as a force or electric charge. Moments are usually defined with respect to a fixed reference point and refer to physical quantities
Moment_(physics)
Process of assigning numbers to objects or events
process of determining how large or small a physical quantity is as compared to a basic reference quantity of the same kind. The scope and application
Measurement
Physical quantity
body or to a physical system, recognizable in the capacity to do work and in the form of heat and light. Energy is a conserved quantity—the law of conservation
Energy
Unit of measurement adopted by convention for a base quantity
measurement adopted for a base quantity. A base quantity is one of a conventionally chosen subset of physical quantities, where no quantity in the subset can be
Base_unit_of_measurement
Mathematical relations between abstract physical quantities
Quantity calculus is the formal method for describing the mathematical relations between abstract physical quantities. Its roots can be traced to Fourier's
Quantity_calculus
Modern form of the metric system
seven units to serve as base units, corresponding to seven base physical quantities. They are the second for time, metre for length, kilogram for mass
International_System_of_Units
Type of energy transfer
Carathéodory wrote: "There exists a physical quantity called heat that is not identical with the mechanical quantities (mass, force, pressure, etc.) and
Heat
This is a list of common physical constants and variables, and their notations. Note that bold text indicates that the quantity is a vector. List of letters
List of common physics notations
List_of_common_physics_notations
Quantity with no physical dimension
Dimensionless quantities, or quantities of dimension one, are quantities defined in a manner that prevents their aggregation into units of measurement
Dimensionless_quantity
Physical law
the value of the physical quantity) is inversely proportional to the square of the distance from the source of that physical quantity. The fundamental
Inverse-square_law
constants listed here are known values of physical constants expressed in SI units; that is, physical quantities that are generally believed to be universal
List_of_physical_constants
Quotient of a quantity by mass
specific or massic typically indicates an intensive quantity obtained by dividing an extensive quantity of interest by mass. For example, specific leaf area
Specific_quantity
Physical quantity of rough surfaces
Normal contact stiffness is a physical quantity related to the generalized force displacement behavior of rough surfaces in contact with a rigid body
Normal_contact_stiffness
Physical quantity of interest in chemistry and electrodynamics
The mass-to-charge ratio (m/Q) is a physical quantity relating the mass (quantity of matter) and the electric charge of a given particle, expressed in
Mass-to-charge_ratio
Description of physical properties at the atomic and subatomic scale
(wave–particle duality), and there are limits to how accurately the value of a physical quantity can be predicted prior to its measurement, given a complete set of
Quantum_mechanics
Physical quantity conserved throughout a motion
In mechanics, a constant of motion is a physical quantity conserved throughout the motion, imposing in effect a constraint on the motion. However, it
Constant_of_motion
Geometric object that has length and direction
be added and scaled to form a vector space. A vector quantity is a vector-valued physical quantity, including units of measurement and possibly a support
Euclidean_vector
Units defined only by physical constants
quantity. If, by a shorthand convention, it is understood that each physical quantity is the corresponding ratio with a coherent Planck unit (or "expressed
Planck_units
Method in physics used to deal with infinities
Renormalization procedures are based on the requirement that certain physical quantities (such as the mass and charge of an electron) equal observed (experimental)
Renormalization
In physics, there are equations in every field to relate physical quantities to each other and perform calculations. Entire handbooks of equations can
Lists_of_physics_equations
Statement based on repeated empirical observations that describes some natural phenomenon
The state of a physical system, be it a particle or a system of many particles, is described by a wavefunction. Every physical quantity is described by
Scientific_law
System that converts an analog signal into a digital signal
measurable physical analog quantity into a digital number can also be considered ADCs, for instance: Rotary encoders convert from an analog physical quantity that
Analog-to-digital_converter
One of the seven units of measurement that define the metric system
from which all other SI units can be derived. The units and their physical quantities are the second for time, the metre (also spelled meter) for length
SI_base_unit
Temperature difference per unit of length
A temperature gradient is a physical quantity that describes in which direction and at what rate the temperature changes the most rapidly around a particular
Temperature_gradient
Magnitude or dimension of a thing
measuring objects, which results in the determination of the magnitude of a quantity, such as length or mass, relative to a unit of measurement. Such a magnitude
Size
Measure of distance to normality
information theory. A similar physical quantity was introduced in 1869 by Massieu for the isothermal process (both quantities differs just with a figure
Negentropy
Mathematical result of division
of Quantities and the International System of Units), "quotient" refers to the general case with respect to the units of measurement of physical quantities
Quotient
Defined standard of a physical quantity
experiment that bears a defined relationship to a unit of measurement of a physical quantity. Standards are the fundamental reference for a system of weights and
Standard_(metrology)
Physical quantity that changes sign with improper rotation
In physics and mathematics, a pseudovector (or axial vector) is a quantity that transforms like a vector under continuous rigid transformations such as
Pseudovector
Measure of sustained displacement of an object from its initial position
controllers are controllers that work on a signal that is proportional to a physical quantity (e.g. displacement, proportional to position) and its integral(s)
Absement
Device for measuring a physical quantity
a physical quantity. In the physical sciences, quality assurance, and engineering, measurement is the activity of obtaining and comparing physical quantities
List_of_measuring_instruments
Visible light per unit solid angle
not the same as the radiant intensity, the corresponding objective physical quantity used in the measurement science of radiometry. Like other SI base
Luminous_intensity
Branch of physics which studies the behavior of materials modeled as continuous media
there is a source of the physical quantity on the surface of the volume, or/and, there is a source of the physical quantity inside the volume. Let Ω {\displaystyle
Continuum_mechanics
Property of a mass in motion
It is a vector quantity, possessing a magnitude and a direction. If m is an object's mass and v is its velocity (also a vector quantity), then the object's
Momentum
and statistics, and measures information with several quantities of information, where quantity is a property that can be quantified by measurement. The
Quantities_of_information
Relationship between two numbers of the same kind
definition adopted in physical sciences (especially in metrology) for ratio is the dimensionless quotient between two physical quantities measured with the
Ratio
Spatial frequency of a wave
is defined as the number of wave cycles divided by length; it is a physical quantity with dimension of reciprocal length, expressed in SI units of cycles
Wavenumber
Comparison of various scales
loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property. Unit conversion is often easier
Conversion_of_units
Change in velocity per amount of fuel
Specific impulse (usually abbreviated as Isp) is a physical quantity defined as the ratio of change in momentum (impulse) to the mass used, usually fuel
Specific_impulse
Ratio of a fluid's advective and diffusive transport rates
ratio of the rate of advection of a physical quantity by the flow to the rate of diffusion of the same quantity driven by an appropriate gradient. In
Péclet_number
Mass per unit area
sizes ("basis ream"). A generalized areic quantity is defined as the quotient of a generic physical quantity by area, such as surface charge density or
Area_density
Physical quantity in radiometry
is a directional quantity: the radiance of a surface depends on the direction from which it is being observed. The related quantity spectral radiance
Radiance
Amount of matter present in an object
In physics, mass is an intrinsic positive physical quantity of a body, which measures its resistance to acceleration. In modern physics, it is generally
Mass
Class of units of measurement for explosive energy
explosives such as dynamite contain more energy. A related concept is the physical quantity TNT-equivalent mass (or mass of TNT equivalent), expressed in the
TNT_equivalent
Measurement describing the power of an illumination
due to the source's temperature. Color Lighting Photometry (optics) Physical quantity Radiometry Spectral density estimation Mark D. Fairchild (2005). Color
Spectral_power_distribution
Scale of numbers with a fixed ratio
the smallest power of ten needed to represent a quantity. Arihant Experts (10 March 2020). "Physical World and Measurement". Indian Air Force Airmen X&Y
Order_of_magnitude
Body of matter in a state of internal equilibrium
settled subject. One reason for this is the existence of a well defined physical quantity called 'the entropy of a body'. Non-equilibrium thermodynamics, as
Thermodynamic_system
Power carried by sound waves
air at a listener's location as a sound energy quantity. Sound intensity is not the same physical quantity as sound pressure. Human hearing is sensitive
Sound_intensity
Mathematical structures that allow quantum mechanics to be explained
from those used in previous models of physical reality. While the mathematics permits calculation of many quantities that can be measured experimentally
Mathematical formulation of quantum mechanics
Mathematical_formulation_of_quantum_mechanics
Mathematical concept applicable to physics
all cases the frequent symbol j, (or J) is used for flux, q for the physical quantity that flows, t for time, and A for area. These identifiers will be
Flux
Type of wave propagating in 3 dimensions
In physics, a plane wave is a special case of a wave or field: a physical quantity whose value, at any given moment, is constant through any plane that
Plane_wave
Physical quantity of hot and cold
view associated with the continuity of classical physical quantities, which states that physical quantities must assume every intermediate value between a
Temperature
Topics referred to by the same term
Unit may refer to: Unit of measurement, a definite magnitude of a physical quantity, defined and adopted by convention or by law International System
Unit
Topics referred to by the same term
(physics), a physical quantity that can be described by a single element of a number field such as a real number Lorentz scalar, a quantity in the theory
Scalar
Scientific instrument to measure gradients from physical properties
gradiometer measures the gradient (numerical rate of change) of a physical quantity, such as a magnetic field or gravity. There are at least two types
Gradiometer
Unit of energy
also sometimes used denoting 1/1000 toe. A related concept is the physical quantity oil-equivalent mass (or mass of oil equivalent), expressed in the
Tonne_of_oil_equivalent
Representation of mechanical stress at every point within a deformed 3D object
point under consideration. However, the stress tensor itself is a physical quantity and as such, it is independent of the coordinate system chosen to
Cauchy_stress_tensor
Terms and symbols widely used in the field of physical chemistry
Quantities, Units and Symbols in Physical Chemistry, also known as the Green Book, is a compilation of terms and symbols widely used in the field of physical
Quantities, Units and Symbols in Physical Chemistry
Quantities,_Units_and_Symbols_in_Physical_Chemistry
Measure of radiant energy over time
(heat transfer) "Thermal insulation — Heat transfer by radiation — Physical quantities and definitions". ISO 9288:1989. ISO catalogue. 1989. Retrieved 2015-03-15
Radiant_flux
Absorbed dose of ionizing radiation weighted with the quality factor
radiation-induced cancer and genetic damage. It is derived from the physical quantity absorbed dose, but also takes into account the biological effectiveness
Equivalent_dose
Topics referred to by the same term
is a physical quantity that expresses hot and cold. Temperature may also refer to: Atmospheric temperature Thermodynamic temperature, a quantity defined
Temperature_(disambiguation)
Assignment of numbers to points in space
possibly physical space. The scalar may either be a pure mathematical number (dimensionless) or a scalar physical quantity (with units). In a physical context
Scalar_field
Standardized quantities and units
international standard ISO 31 on quantities and units. It provides guidelines for using physical quantities, quantity and unit symbols, and coherent unit
ISO_31-0
Influence that can change motion of an object
classified as "vector quantities". This means that forces follow a different set of mathematical rules than physical quantities that do not have direction
Force
Act of placing two elements side by side
used for "multiplication" of a numerical value and a physical quantity, and of two physical quantities, for example, three times π {\displaystyle \pi } would
Juxtaposition
Topics referred to by the same term
particular (i.e., specific and named) pathogens A specific quantity generally means a physical quantity normalized "per unit" of something (often mass). SPECIFIC
Specific
Operator in quantum mechanics
canonical momentum, which is not gauge invariant and not a measurable physical quantity for charged particles in an electromagnetic field. In that case, the
Momentum_operator
Unit of measurement of optical power
express the optical power of a lens or curved mirror, which is a physical quantity equal to the reciprocal of the focal length, expressed in metres.
Dioptre
Quantity in electromagnetism
electromagnetism, magnetic vector potential (often denoted A) is the vector quantity defined so that its curl is equal to the magnetic field, B: ∇ × A = B {\textstyle
Magnetic_vector_potential
Concept in physics
mass-specific quantity defined as the quotient of force per unit mass. S F = F / m {\displaystyle \mathrm {SF} =F/m} It is a physical quantity of kind acceleration
Specific_force
Vector field representing a mass's effect on surrounding space
equivalence principle. In classical mechanics, a gravitational field is a physical quantity. A gravitational field can be defined using Newton's law of universal
Gravitational_field
International standard on physical quantities and units of measurement
Electrotechnical Commission (IEC). It serves as a style guide for using physical quantities and units of measurement, formulas involving them, and their corresponding
ISO/IEC_80000
- supplier of research materials in small quantities - Goodfellow". www.goodfellow.com. "Typical Physical Properties, Plexiglas® V045i, Acrylic Resin"
List of thermal conductivities
List_of_thermal_conductivities
Physical parameter of a drainage basin
Drainage density is a quantity used to describe physical parameters of a drainage basin. First described by Robert E. Horton, drainage density is defined
Drainage_density
Continuous progression from past to future
the seven fundamental physical quantities in both the International System of Units (SI) and International System of Quantities. The SI base unit of time
Time
Physical quantity of dimension energy × time
In physics, action is a scalar quantity that describes how the balance of kinetic versus potential energy of a physical system changes with trajectory
Action_(physics)
Measure of distance in physical space
Length is a measure of distance. In the International System of Quantities, length is a quantity with dimension distance. In most systems of measurement a base
Length
Topics referred to by the same term
probability theory and statistics Moment (physics), a combination of a physical quantity and a distance Moment of force or torque Present time An instant Moment
Moment
Change in luminosity of a moving object due to special relativity
deriving the beaming equations starts with the quantity S ν 3 {\displaystyle {\frac {S}{\nu ^{3}}}} . This quantity is a Lorentz invariant, so the value is the
Relativistic_beaming
Mathematical object that describes the electromagnetic field in spacetime
relativity was introduced by Hermann Minkowski. The EM tensor allows related physical laws to be written concisely, and allows for the quantization of the electromagnetic
Electromagnetic_tensor
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