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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.
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.
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
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What does si units stand for?
SI is an abbreviation of the French "le Système International d'unités"which when translated in to English means "The International System of Units".
There are six basic SI units of measurement?
There are 7 basic units
What are the basic Si units and their derived units?
The SI is founded on seven SI base units for seven base quantities assumed to be mutually independent.These are :length meter m mass kilogram kg time second s electric current ampere A thermodynamic temperature kelvin K amount of substance mole mol luminous intensity candela cdOther quantities, called derived quantities, are defined in terms of the seven base quantities via a system of quantity equations. The SI derived units for these derived quantities are obtained from these quations and the seven SI base units.
How is the SI system used in the scientific community?
SI units are standardized among most countries which allows measurements done in one to be valid and reproducible in any other participating country. Not all countries use there units, most noticeably the USA and Great Britain.
The SI you units used to describe power are?
Watts
What do you call the principal SI units that are used to derive all other SI units?
The principal SI units used to derive all other SI units are the base SI units. These are the units for physical quantities such as length, time, mass, electric current, temperature, amount of substance, and luminous intensity.
What is the difference between SI base units and derived units.?
There are 7 base SI units and all other are defined using these 7 base units. See the related question below:[http://wiki.answers.com/Q/What_are_all_the_SI_unitsWhat are all SI units?]
What values can not be measured using SI units a. length b. density c. temperature d. all of the above?
The correct answer doesn't appear in the list of choices.Each of those three quantities CAN be describes in SI units.
What the difference between SI base unit and SI derived unit?
There are 7 base SI units and all other are defined using these 7 base units. See the related question below:[http://wiki.answers.com/Q/What_are_all_the_SI_unitsWhat are all SI units?]
Are all metric units also system international?
No, not all metric units are part of the International System of Units (SI). The SI is a coherent system of units derived from the metric system, but it is more specific and defined, and not all metric units are included in the SI.
What is the unit for measuring foece?
In SI units, that would be the Newton.In SI units, that would be the Newton.In SI units, that would be the Newton.In SI units, that would be the Newton.
Do all scientist use SI units?
jelly beans
Why an airplane do not use the metric system?
All units used in the aerospace industry are SI units.
What are SI units and how do you convert them to metric?
SI and metric are the same units.
SI is an abbreviation for System of Units?
International System of Units (SI)
What are the general mathematical operations you use when converting one si unit to another?
All SI units are powers of 10. Multiplying by 10 will convert units.
How do tell what your BMI should be?
In SI Units: BMI = kg/m2In Imperial Units: BMI = lb*703/in2 or l*4.88/ft2PS: I love SI Units. I use them all the time.
