What are the 7 SI Unit?

Answer 1

Metres (m) for length/distance; kilograms (kg) for mass; seconds (s) for time; ampere (A) for electrical current; degrees Kelvin (oK) for thermodynamic temperature; candela (cd) for luminous intensity - brightness; mole (mol) for amount of substance.

Answer 2

mass

length

time

amount of substance

temperature

current

luminous intensity
Time: second - defined by vibrations of a particular atom. ("the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.")

Distance: metre - defined by the distance light travels in 1/299,792,458th of a second.

Current: Ampere - the definition of this one is rather complex. It measures the force between two wires, 1m apart in a vacuum. If they carry a current of 1A, the force between the wires is 10-7 Newtons.

Temperature: Kelvin - 0 K is defined to be absolute zero (zero thermal energy) and 273.16 Kelvin is defined to be the Triple Point of water (0.01 degree Celsius), the rest is linear.

Luminosity: Candela - This measures the power output of a light source in a particular direction, per unit area. It is currently defined as 540 x 1012 Hz light, emitting 1/683 Watts per steradian.

Mole: amount of something - Defined as the number of atoms in 12g of pure Carbon-12.

Mass: kilogram - defined according to a standard kilogram held in a vault in France. Work is ongoing to come up with a Universal definition.

Answer 3

1. Length (meter)

2. Mass (kilogram)

3. Time (second)

4. Electric current (ampere)

5. Thermodynamic Temperature (kelvin)

6. Amount of substance (mole)

7. Luminous intensity (candela)

Answer 4

i think these are the seven basic units in SI unit in my physics book

length = metre = m

mass = kilogram = kg

time = second = s

electric current = ampere = A

temperate = kelvin = K

volume = cubic metre = m3

area = square metre = m2

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please discuss about this answer in the discussion board since this may not be fully correct or improve the answer

there are many si units in many fields like force SI unit is newton

and more

Answer 5

There are several "metric systems"; the question probably refers to the most recent version, the SI (Système international d'unités):

kilogram for mass
meter for length
second for time
Ampere for electric current
mole for amount of substance
Kelvin for temperature
candela for luminous intensity

Other units are derived from these 7, for example, meters squared for surface, meters per second for velocity, etc.