List of SI Unit | Full Table of SI Unit, Symbols, Signs and Abbreviations

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Important SI Unit (System International)

SI Unit

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Important SI Unit (System International)
आधार राशि प्रतीक वर्णन SI मात्रक बिमा का संकेत टिप्पणी
लम्बाई l किसी वस्तु का एकविमिय विस्तार मीटर (m) L
द्रव्यमान  m किसी वस्तु में द्रव्य (पदार्थ) की मात्रा किलोग्राम (kg) M extensive
समय t किसी घटना की अवधि सेकेंड (s) T
विद्युत धारा I विद्युत आवेश के प्रवाह की दर ampere (A) I
तापमान T Average energy per degree of freedom of a system. kelvin (K) Θ intensive
पदार्थ की मात्रा n Number of particles compared to the number of atoms in 0.012 kg of 12C. मोल (mol) N extensive
ज्योती तीव्रता L Amount of energy emitted by a light source in a particular direction. कैन्डेला (cd) J
व्युत्पन्न मात्रक चिह्न विवरण SI मात्रक विमा टिप्पणी
Heat flux density ϕQ Amount of heat flowing through a surface per unit area. W m−2 M T−3
Angular speed (or angular velocity) ω or ω The angle incremented in a plane by a segment connecting an object and a reference point. rad s−1 T−1 scalar or pseudovector
ठोस कोण Ω Measure of the size of an object as projected on a sphere. स्टेरेडियन (sr) 1
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−1s−2) M L2 T−2 I−1 scalar
Mean lifetime τ Average time needed for a particle to decay. s T intensive
Stress σ Amount of force exerted per surface area. Pa M L−1 T−2 2-tensor. (or scalar)
Electric charge density ρQ Amount of electric charge per unit volume. C m−3 I T L−3 intensive
Linear density ρl Amount of mass per unit length of a one dimensional object. M L−1
Energy density ρE Amount of energy per unit volume. J m−3 M L−1 T−2 intensive
Area density ρA The amount of mass per unit area of a two dimensional object. kg m−2 M L−2
(Mass) Density(volume density) ρ The amount of mass per unit volume of a three dimensional object. kg m−3 M L−3 intensive
Permeability μ Measure for how the magnetization of material is affected by the application of an external magnetic field. H m−1 M L−1 I−2 intensive
Chemical potential μ The amount of energy needed to add a particle to a system. J mol−1 M L2 T−2 N−1 intensive
Wavelength λ Distance between repeating units of a propagating wave. m L
कोण θ Measure of a change in direction or orientation. रेडियन 1
Dynamic Viscosity η Measure for the resistance of an incompressible fluid to stress. Pa s M L−1 T−1
Permittivity ε Measure for how the polarization of a material is affected by the application of an external electric field. F m−1 I2 M−1 L−2 T4 intensive
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
Angular acceleration α Rate of change in angular speed or velocity. rad s−2 T−2
Impedance Z Measure for the resistance of an electrical circuit against an alternating current. ohm (Ω = kg m2 A−2 s−3) L2 M T−3 I−2 complex scalar
Mass fraction x Mass of a substance as a fraction of the total mass. kg/kg 1 intensive
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 L2 T−2 scalar
Weight w Amount of gravitation force exerted on an object. newton (N = kg m s−2) M L T−2
Volume V The three dimensional extent of an object. m3 L3 extensive
Velocity v Speed of an object in a chosen direction. m s−1 L T−1 vector
Speed v Rate of change of the position of an object. m s−1 L T−1 scalar
Specific volume v The volume occupied by a unit mass of material (reciprocal of density)। m3 kg−1 L3 M−1 intensive
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) L2 M T−3 I−1 scalar
Half-life t1/2 The time needed for a quantity to decay to half its original value. s T
Torque (moment of force) T Product of a force and the perpendicular distance of the force from the point about which it is exerted. N m M L2 T−2 pseudovector
Spin S Intrinsic property of particles, roughly to be interpreted as the intrinsic angular momentumof the particle. kg m2 s−1 M L2 T−1
Entropy S Measure for the amount of available states for a system. J K−1 M L2 T−2 Θ−1 extensive, scalar
Reaction rate r Measure for speed of a chemical reaction. mol m−3 s−1 N L−3 T−1 intensive
Electrical resistance R The degree to which an object opposes the passage of an electric current. ohm (Ω = kg m2 A−2 s−3) L2 M T−3 I−2 scalar
Heat Q Amount of energy transferred between systems due to temperature difference. J M L2 T−2
Electric Charge Q Amount of electric charge. coulomb (C = A s) I T extensive, conserved quantity
Pressure p Amount of force per unit area. pascal (Pa = kg m−1 s−2) M L−1 T−2 intensive
Power P The rate of change in energy over time. watt (W) M L2 T−3 extensive
Momentum p Product of an object’s mass and velocity. N s M L T−1 vector, extensive
Impulse p The cause of a change in momentum, acting on an object. kg m s−1 M L T−1 vector
Index of refraction n The factor by which the speed of light is reduce in a medium. 1 intensive
Magnetization M Amount of magnetic moment per unit volume. A m−1 I L−1 vector field
Radiance L Power of emitted electromagnetic radiation per solid angle and per projected source area. W m−2 sr−1 M T−3
Inductance L Measure for the amount of magnetic flux generated for a certain current run through a circuit. henry (H = kg m2 A−2s−2) M L2 T−2 I−2
Angular momentum L Measure of the extent and direction and object rotates about a reference point. kg m2 s−1 M L2 T−1 conserved quantity, pseudovector
Wavenumber k Reciprocal of the wavelength. m−1 L−1
Thermal conductivity k Measure for the ease with which a material conducts heat. W m−1 K−1 M L−1 T−3 Θ−1 intensive
Current density J Amount of electric current flowing through a surface. A m−2 I L−2
Radiant intensity I Power of emitted electromagnetic radiation per solid angle. W sr−1 M L2 T−3 scalar
Moment of inertia I Inertia of an object with respect to angular acceleration. kg m2 M L2 scalar
Magnetic field strength H Strength of a magnetic field in a material. A m−1 I L−1 vector field
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) L2 T−2
Electrical conductance G Meausure for how easily current flows through a material. siemens (S = A2 s3 kg−1m−2) L−2 M−1 T3 I2 scalar
Luminous flux (or luminous power) F Perceived power of a light source. lumen (lm = cd sr) J
Frequency f The number of times something happens in a period of time. hertz (Hz =s−1) T−1
Force F The cause of acceleration, acting on an object. newton (N = kg m s−2) M L T−2 vector
Illuminance Ev Total luminous flux incident to a surface per unit area. lux (lx = cd sr m−2) J L−2
Irradiance E Power of electromagnetic radiation flowing through a surface per unit area. W m−2 M T−2
Energy E The capacity of a body or system to do work. joule (J = kg m2 s−2) M L2 T−2 extensive, scalar, conserved quantity
Electric field strength E Strength of the electric field. V m−1 M I−1 L2 T−3 vector field
Electric displacement D Strength of the electric displacement. C m−2 I T L−2 vector field
(Radioactive) Dose D Amount of energy absorbed by biological tissue from ionizing radiation per unit mass. gray (unit) (Gy = m2 s−2) L2 T−2
Heat capacity Cp Amount of energy needed to raise the temperature of a system by one degree. J K−1 M L2 T−2 Θ−1 extensive
Specific heat capacity c Heat capacity per unit mass. J kg−1 K−1 L2 T−2 Θ−1 intensive
Molar heat capacity c Heat capacity of a material per unit amount of substance. J K−1 mol−1 M L2 T−2 N−1 intensive
Molar concentration C Amount of substance per unit volume. mol m−3 N L−3 intensive
Capacitance C Measure for the amount of stored charge for a given potential. farad (F = A2 s4 kg−1m−2) I2 T4 M−1 L−2
Magnetic flux density B Measure for the strength of the magnetic field. tesla (T = kg A−1 s−2) M T−2 I−1 pseudovector field
Area A The two dimensional extent of an object. m2 L2
Acceleration a Rate of change of the speed or velocity of an object. m s−2 L T−2 scalar or vector
(Radioactive) Activity A Number of particles decaying per unit time. becquerel (Bq = s−1) T−1 extensive
Specific energy Amount of energy present per unit mass. J kg−1 L2 T−2 intensive
Molar entropy Amount of entropy present in a system per unit amount of substance. J K−1 mol−1 M L2 T−2 Θ−1 N−1 intensive
Molar energy Amount of energy present is a system per unit amount of substance. J mol−1 M L2 T−2 N−1 intensive
Catalytic activity concentration Change in reaction rate due to presence of a catalyst per unit volume of the system. kat m−3 N L−3 T−1
Catalytic activity Change in reaction rate due to presence of a catalyst. katal (kat = mol s−1) N T−1
Absorbed dose rate Absorbed dose received per unit of time. Gy s−1 L2 T−3

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