What are all the SI units?

Answer 1

SI stands for theInternational System of Units. They are called "SI" units because in French, International System of Units is written Système International d'Unités.

SI Base Units

• Length: meter (metre, m)
• Mass: kilogram (kg)
• Time: second (s)
• Electric current: ampere (A)
• Thermodynamic temperature: Kelvin (K)
• Amount of substance: mole (mol)
• Luminous intensity: candela (CD)

Some Derived SI Units :-The name of the unit and its symbol(s) is listed for each.

• Area: square meter (m2)
• Volume: cubic meter (m3) and liter (litre, L) (1 m3 = 1000 L)
• Frequency: Hertz (Hz, s-1)
• Density: kilogram per cubic meter (kg/m3) or gram per mL (g/mL) (1000 kg/m3 = 1 g/mL)
• Velocity or Speed: meter per second (m/s)
• Angular Velocity: radian per second (rad/s)
• Angular Displacement: radian (rad)
• Acceleration: meter per second per second (m/s2)
• Force: newton (N, kg .m/s2)
• Torque:newton meter (Nm)
• Pressure: pascal (P, N/m2)
• Work, Energy, Heat: joule (J, N . m)
• Power: watt (W, J/s)
• Electric Charge: coulomb (C, A . s)
• Potential difference: volt (V, W/A, J/C)
• Electric Field: volt per meter or newton per coulomb (V/m, N/C)
• Electric Resistance: ohm (Greek letter Omega, V/A)
• Electrical conductivity: siemen (S, 1/R)
• Capacitance: farad (F, A .s/V)
• Magnetic Flux: weber (Wb, V .s)
• Inductance: Henry (H, W .s/A)
• Magnetic Flux Density: tesla (T, Wb/m2)
• Magnetic Field Strength: ampere per meter (A/m)
• Entropy: joule per kelvin (J/K)
• Specific Heat: joule per kilogram kelvin (J/(kg . K))
• Thermal Conductivity: watt per meter kelvin (W/(m . K))
• Radiant Intensity: watt per steradian (W/sr)

*Use the related Links below this answer to get more information about SI units, including prefixes and other related units.

Answer 2

The seven SI base units are:

• The metre, m, length
• The kilogram, kg, mass
• The second, s, time
• The ampere, A, electrical current
• The kelvin, K, thermodynamic temperature
• The candela, cd, luminous intensity (brightness)
• The mole, mol, amount of a substance

Numerous other units are derived from each or from combinations of two or more. For example, the cubic metre is the unit of volume and is derived simply from cubing the metre; the newton is the unit for force and is derived from kilograms, metres and seconds.

Answer 3

The SI base units are length, mass, time , electric current, temperature , amount of substance and luminous intensity.

Initially in olden days scientists considered units of length, mass and time as base. These are meter, kilogram and second. Later they found so essential to find units of electric current (ampere), of temperature (kelvin), amount of substance (mole) and luminous intensity (candella)

So basically there are seven units. More over as supplementary they bring unit of plane angle (radian) and of solid angle (steradian)

Hence 9 units are taken as base units

Answer 4

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