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# Physical Quantities

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https://en.wikipedia.org/wiki/Physical_quantity

A physical quantity is a physical property of a phenomenon, body, or substance, that can be quantified by measurement. A physical quantity can be expressed as the combination of a magnitude expressed by a number – usually a real number – and a unit; for example, 1.6749275×10−27 kg (the mass of the neutron), or 299792458 metres per second (the speed of light). Physical quantities are measured as n u {\textstyle nu} where is the magnitude and is the unit. For example: A boy measured the length of a room as 3 m. Here 3 is the magnitude and m (metre) is the unit. 3 m can also be written as 300 cm. The same physical quantity can be represented equivalently in many unit systems, i.e. .

https://en.wikipedia.org/wiki/List_of_physical_quantities

Base quantity Symbol Description SI unit Symbol for dimension Comments
Length l The one-dimensional extent of an object. metre (m) L
Mass m The amount of matter in an object. kilogram (kg) M extensive, scalar
Time t The duration of an event. second (s) T scalar
Electric current I Rate of flow of electrical charge. ampere (A) I
Temperature T Average energy per degree of freedom of a system. kelvin (K) Θ intensive, scalar
Amount of substance n Number of particles compared to the number of atoms in 0.012 kg of 12C. mole (mol) N extensive, scalar
Luminous intensity L Amount of energy emitted by a light source in a particular direction. candela (cd) J scalar

This list is incomplete; you can help by expanding it.

Derived quantity
Plane angle θ Measure of a change in direction or orientation. radian (rad) 1
Solid angle Ω Measure of the size of an object as projected on a sphere. steradian (sr) 1
Absorbed dose rate
Absorbed dose received per unit of time. Gy s−1 L2T−3
Acceleration a Rate of change of the speed or velocity of an object. m s−2 L T−2 vector
Angular acceleration α Rate of change in angular speed or velocity. rad s−2 T−2
Angular speed (or angular velocity) ω The angle incremented in a plane by a segment connecting an object and a reference point per unit time. rad s−1 T−1 scalar or pseudovector
Angular momentum L Measure of the extent and direction an object rotates about a reference point. kg m2 s−1 M L2T−1 conserved quantity, pseudovector
Area A The two-dimensional extent of an object. m2 L2 scalar
Area density ρA The amount of mass per unit area of a two-dimensional object. kg m−2 M L−2
Capacitance C Measure for the amount of stored charge for a given potential. farad (F = A2 s4 kg−1 m−2) I2T4M−1L−2 scalar
Catalytic activity
Change in reaction rate due to presence of a catalyst. katal (kat = mol s−1) N T−1
Catalytic activity concentration
Change in reaction rate due to presence of a catalyst per unit volume of the system. kat m−3 N L−3T−1
Chemical potential μ The amount of energy needed to add a particle to a system. J mol−1 M L2T−2N−1 intensive
Molar concentration C Amount of substance per unit volume. mol m−3 N L−3 intensive
Crackle c Rate of change of Jounce. The fifth derivative of position. m s−5 L T−5 Vector
Current density J Amount of electric current flowing through a surface. A m−2 I L−2 vector
Dose equivalent H Measure for the received amount of radiation adjusted for the effect of different types of radiant on biological tissue. sievert (Sv = m2 s−2) L2T−2
Dynamic Viscosity η Measure for the resistance of an incompressible fluid to stress. Pa s M L−1T−1
Electric Charge Q Amount of electric charge. coulomb (C = A s) I T extensive, conserved quantity
Electric charge density ρQ Amount of electric charge per unit volume. C m−3 I T L−3 intensive
Electric displacement D Strength of the electric displacement. C m−2 I T L−2 vector field
Electric field strength E Strength of the electric field. V m−1 M L T−3I−1 vector field
Electrical conductance G Meausure for how easily current flows through a material. siemens (S = A2 s3 kg−1 m−2) L−2M−1T3I2 scalar
Electric potential V The amount of work required to bring a unit charge into an electric field from infinity. volt (V = kg m2 A−1 s−3) L2M T−3I−1 scalar
Electrical resistance R The degree to which an object opposes the passage of an electric current. ohm (Ω = kg m2 A−2 s−3) L2M T−3I−2 scalar
Energy E The capacity of a body or system to do work. joule (J = kg m2 s−2) M L2T−2 extensive, scalar, conserved quantity
Energy density ρE Amount of energy per unit volume. J m−3 M L−1T−2 intensive
Entropy S Measure for the amount of available states for a system. J K−1 M L2T−2Θ−1 extensive, scalar
Force F The cause of acceleration, acting on an object. newton (N = kg m s−2) M L T−2 vector
Fuel efficiency
Distance traveled per meter cubed.
L−2 scalar
Impulse p The cause of a change in momentum, acting on an object. kg m s−1 M L T−1 vector
Frequency f The number of times something happens in a period of time. hertz (Hz =s−1) T−1 scalar
Half-life t1/2 The time needed for a quantity to decay to half its original value. s T
Heat Q Amount of energy transferred between systems due to temperature difference. J M L2T−2
Heat capacity Cp Amount of energy needed to raise the temperature of a system by one degree. J K−1 M L2T−2Θ−1 extensive
Heat flux density ϕQ Amount of heat flowing through a surface per unit area. W m−2 M T−3
Illuminance Ev Total luminous flux incident to a surface per unit area. lux (lx = cd sr m−2) J L−2
Impedance Z Measure for the resistance of an electrical circuit against an alternating current. ohm (Ω = kg m2 A−2 s−3) M'L'2T−3I−2 complex scalar
Index of refraction n The factor by which the speed of light is reduced in a medium.
1 intensive, scalar
Inductance L Measure for the amount of magnetic flux generated for a certain current run through a circuit. henry (H = kg m2 A−2 s−2) M L2T−2I−2 scalar
Irradiance E Power of electromagnetic radiation flowing through a surface per unit area. W m−2 M T−3
Intensity I Power per unit cross sectional area. W m−2 M T−3
Jerk j Rate of change of acceleration. The third derivative of position. m s−3 L T−3 Vector
Jounce (or snap) s Rate of change of Jerk. The fourth derivative of position. m s−4 L T−4 Vector
Linear density ρl Amount of mass per unit length of a one-dimensional object.
M L−1
Luminous flux (or luminous power) F Perceived power of a light source. lumen (lm = cd sr) J
Mach Number (or mach) M Ratio of flow velocity to the local speed of sound. Unitless (M = u/c) 1
Magnetic field strength H Strength of a magnetic field in a material. A m−1 I L−1 vector field
Magnetic flux Φ Measure of quantity of magnetism, taking account of the strength and the extent of a magnetic field. weber (Wb = kg m2 A−1 s−2) M L2T−2I−1 scalar
Magnetic flux density B Measure for the strength of the magnetic field. tesla (T = kg A−1 s−2) M T−2I−1 pseudovector field
Magnetization M Amount of magnetic moment per unit volume. A m−1 I L−1 vector field
Mass fraction x Mass of a substance as a fraction of the total mass. kg/kg 1 intensive
(Mass) Density (or volume density) ρ The amount of mass per unit volume of a three-dimensional object. kg m−3 M L−3 intensive
Mean lifetime τ Average time needed for a particle to decay. s T intensive
Molar energy
Amount of energy present is a system per unit amount of substance. J mol−1 M L2T−2N−1 intensive
Molar entropy
Amount of entropy present in a system per unit amount of substance. J K−1 mol−1 M L2T−2Θ−1N−1 intensive
Molar heat capacity c Heat capacity of a material per unit amount of substance. J K−1 mol−1 M L2T−2N−1 intensive
Moment of inertia I Inertia of an object with respect to angular acceleration. kg m2 M L2 tensor, scalar
Momentum p Product of an object's mass and velocity. N s M L T−1 vector, extensive
Permeability μ Measure for how the magnetization of material is affected by the application of an external magnetic field. H m−1 M L T−2I−2 intensive
Permittivity ε Measure for how the polarization of a material is affected by the application of an external electric field. F m−1 I2M−1L−3T4 intensive
Power P The rate of change in energy over time. watt (W) M L2T−3 extensive, scalar
Pressure p Amount of force per unit area. pascal (Pa = kg m−1 s−2) M L−1T−2 intensive, scalar
Pop p Rate of change of crackle. The sixth derivative of position. m s−6 L T−6 Vector
(Radioactive) Activity A Number of particles decaying per unit time. becquerel (Bq = s−1) T−1 extensive, scalar
(Radioactive) Dose D Amount of energy absorbed by biological tissue from ionizing radiation per unit mass. gray (unit) (Gy = m2 s−2) L2T−2
Radiance L Power of emitted electromagnetic radiation per solid angle and per projected source area. W m−2 sr−1 M T−3
Radiant intensity I Power of emitted electromagnetic radiation per solid angle. W sr−1 M L2T−3 scalar
Reaction rate r Measure for speed of a chemical reaction. mol m−3 s−1 N L−3T−1 intensive, scalar
Refractive Index n Measure of how light is refracted through a medium. Unitless Dimensionless
Angle θ The space between two intersecting lines at or close to the point where they meet. rad / Degree Dimensionless
Speed v Rate of change of the position of an object. m s−1 L T−1 scalar
Specific energy
Amount of energy present per unit mass. J kg−1 L2T−2 intensive
Specific heat capacity c Heat capacity per unit mass. J kg−1 K−1 L2T−2Θ−1 intensive
Specific volume v The volume occupied by a unit mass of material (reciprocal of density). m3 kg−1 L3M−1 intensive
Spin S Intrinsic property of particles, roughly to be interpreted as the intrinsic angular momentum of the particle. kg m2 s−1 M L2T−1
Strain
Extension per unit length. Unitless Dimensionless
Stress σ Amount of force exerted per surface area. Pa M L−1T−2 2-tensor. (or scalar)
Surface tension γ Amount of work needed to change the surface of a liquid by a unit surface area. N m−1 or J m−2 M T−2
Thermal conductivity k Measure for the ease with which a material conducts heat. W m−1 K−1 M L T−3Θ−1 intensive
Torque τ Product of a force and the perpendicular distance of the force from the point about which it is exerted. N m M L2T−2 pseudovector
Velocity v Speed of an object in a chosen direction. m s−1 L T−1 vector
Volume V The three dimensional extent of an object. m3 L3 extensive, scalar
Wavelength λ Distance between repeating units of a propagating wave. m L
Wavenumber k Reciprocal of the wavelength. m−1 L−1
Weight w Amount of gravitation force exerted on an object. newton (N = kg m s−2) M L T−2 vector
Work W Energy dissipated by a force moving over a distance, scalar product of the force and the movement vector. joule (J = kg m2 s−2) M L2T−2 scalar
Young's modulus ε Ratio of Stress over Strain. pascal (Pa = kg m−1 s−2) M L−1T−2 scalar
Absement A Measure of sustained displacement; the first integral of displacement. m s LT vector

Unit For a Physical quantity

'Velocity of speed m/s Acceleration m/s2 Density kg/m3 Forces N /sup> |extensive |- |Heat flux density |style="text-align: center" | ″ velocity of speed vinayaka m/s density vinayaka m/s2 forces vinayaka N

https://en.wikipedia.org/wiki/Category:Physical_quantities

Subcategories

A
`    ► Acceleration‎ (3 C, 23 P)
► Amount of substance‎ (2 C, 26 P)
► Area‎ (3 C, 34 P)
`C
`    ► Capacitance‎ (2 C, 6 P)
► Physical constants‎ (3 C, 37 P)
`D
`    ► Density‎ (2 C, 38 P)
`E
`    ► Electric charge‎ (1 C, 7 P)
► Electrical resistance and conductance‎ (6 C, 16 P)
► Enthalpy‎ (15 P)
► Entropy‎ (3 C, 19 P, 1 F)
► Thermodynamic entropy‎ (1 C, 40 P)
`F
`    ► Force‎ (8 C, 69 P)
`G
`    ► Geometric measurement‎ (4 C, 12 P)
`L
`    ► Length‎ (6 C, 30 P)
► Logarithmic scales of measurement‎ (1 C, 25 P)
`M
`    ► Mass‎ (6 C, 67 P)
► Molar quantities‎ (2 P)
`P
`    ► Power (physics)‎ (7 C, 17 P)
► Pressure‎ (7 C, 31 P)
`R
`    ► Rates‎ (6 C, 67 P)
`S
`    ► Sound measurements‎ (33 P)
`T
`    ► Temperature‎ (8 C, 61 P)
► Time‎ (29 C, 55 P)
`V
`    ► Velocity‎ (4 C, 21 P)
► Viscosity‎ (2 C, 32 P)
► Visibility‎ (2 C, 23 P)
► Voltage‎ (5 C, 10 P)
► Volume‎ (4 C, 22 P)

Pages

`    ANSI/ASA S1.1-2013
International System of Quantities
ISO 31
ISO/IEC 80000
List of physical quantities
Physical quantity
Quantity calculus
`A
`    Absorbed dose
Absorptance
Acceleration
Acoustic impedance
Aggregate modulus
Amplitude
Angular acceleration
Angular diameter distance
Angular frequency
Angular momentum
Angular velocity
API gravity
Areal velocity
Attenuation coefficient
Audio frequency
`B
`    Bollard pull
Bulk modulus
`C
`    Capacitance
Carcel
Characteristic property
Charge (physics)
Circular dichroism
Coercivity
Cohesion (chemistry)
Colorimetry
Comoving distance
Conductance quantum
Couple (mechanics)
Crystallinity
Cusec
`D
`    Defining equation (physics)
Delta-v (physics)
Density
Displacement (fluid)
Distance measures (cosmology)
Distance modulus
Dust resistant
Dynamic modulus
`E
Elastance
Electric charge
Electric field
Electric flux
Electric intensity
Electric potential
Electric susceptibility
Electrical measurements
Electrical mobility
Electrical resistance and conductance
Electrical resistivity and conductivity
Electron mobility
Emissivity
Energy flux
Enthalpy
Equivalent dose
Etherington's reciprocity theorem
Excess molar quantity
Extracellular field potential
`F
`    Fermi acceleration
Field strength
Film speed
Flux
Force
Frequency
Fuel efficiency
`G
`    Gravity (chemistry)
Ground pressure
Group velocity
`H
`    Heat capacity
Heat capacity rate
Heat capacity ratio
Huber's equation
Humidity
Critical relative humidity
Relative humidity
Hypervelocity
`I
`    Illuminance
Immittance
Electrical impedance
Characteristic impedance
Impulse (physics)
Inductance
Infinitesimal strain theory
Intensity (physics)
Intensive and extensive properties
Ion transport number
Ionic strength
`J
`    Jerk (physics)
Jounce
`L
`    Length
List of electromagnetism equations
List of equations in fluid mechanics
List of equations in gravitation
List of equations in nuclear and particle physics
List of equations in quantum mechanics
List of equations in wave theory
List of materials properties
List of moments of inertia
List of photonics equations
Luminance
Luminosity
Luminosity distance
Luminosity function
Luminous efficacy
Luminous energy
Luminous flux
Luminous intensity
`M
`    Magnetic braking
Magnetic field
Magnetic flux
Magnetic helicity
Magnetic hysteresis
Magnetic moment
Magnetic susceptibility
Magnetomotive force
Mass
Mass attenuation coefficient
Mass flux
Maximum density
Measured quantity
Mechanical impedance
Memcapacitor
Memductance
Meminductor
Memristance
Molar volume
Molecular property
Moment (physics)
Moment of inertia
Momentum
`N
`    Negative resistance
Neutron magnetic moment
Noise-equivalent flux density
Noise-equivalent target
Notch tensile strength
Number density
`O
`    Ohm metre
Orders of magnitude (speed)
`P
`    Particle displacement
Particle number
Particle velocity
Permeability (electromagnetism)
Permeation
Permittivity
Persistence length
Phase (waves)
Physical coefficient
Physical property
Pinning points
Plastic crystal
Poisson's ratio
Propagation constant
`Q
`    Quality (physics)
Quantum efficiency
Quartz crystal microbalance with dissipation monitoring
`R
Rate of penetration
Electrical reactance
Reciprocal length
Redshift
Reflectance
Refractive index
Relative density
Relative velocity
Rotational speed
`S
`    Scale of temperature
Second moment of area
Signal-to-noise ratio (imaging)
Single-particle spectrum
Solubility
Sound energy
Sound energy density
Sound exposure
Sound intensity
Sound power
Sound pressure
Specific detectivity
Specific force
Specific gravity
Specific impulse

S
`    Specific weight
Spectral power distribution
Speed
Speed of sound
Spin (physics)
Spin angular momentum of light
Stiffness
Suction
Surface power density
Susceptance
System-specific impulse
`T
`    Temperature
Thermal conductance quantum
Thermal conduction
List of thermal conductivities
Thermal conductivity
Thermal contact conductance
Thermal diffusivity
Thermal effusivity
Thermal emittance
Thermal equilibrium
Thermal expansion
Thermomass theory
Time
Tonti diagram
Torque
Transmission loss (duct acoustics)
Transmittance
Turbidity
`V
`    Vapor quality
Voltage
Volume (thermodynamics)
Volumetric flux
Volumetric heat capacity
`W
`    Waterproofing
Work (physics)
`Y
`    Young's modulus

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