Question

Write some important measurable quantities and there unit and symbols?

Answer 1

mass, volume,intensity,avogadro number,capcitance,meter

are the units of spl!

thanks!!

Answer 2

The value of a physical quantity is usually expressed as the product of a number and a unit. The unit represents a specific example or prototype of the quantity concerned, which is used as a point of reference. The number represents the ratio of the value of the quantity to the unit. In the case of the kilogram, the prototype is a platinum-iridium cylinder held under tightly controlled conditions in a vault at the BIPM, although there are a number of identical copies kept under identical conditions located throughout the world. A quantity of two kilograms (2 kg) would have exactly twice the mass of the prototype or one of itsQty Sym. Unit Unit

Sym. Unit Definition

length l metre m The length of the path travelled by light in 1/299 792 458 of a second

mass m kilogram kg The mass of the International Prototype Kilogram

time t second s 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, at rest, at a temperature of 0 K

electric

current I ampere A The constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed one metre apart in a vacuum, would produce between these conductors a force equal to 2 x 10-7 newton per metre of length

thermodynamic

temperature T kelvin K The fraction 1/273.16 of the thermodynamic temperature of the triple point of water

amount

of

substance n mole mol The amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12 (elementary entities, which must be specified, may be atoms, molecules, ions, electrons, other particles or specified groups of such particles)

luminous

intensity Iv candela cd The luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of 1/683 watts per steridian copies. There are seven base quantities used in the International System of Units. The seven base quantities and their corresponding units are:

length (metre)

mass (kilogram)

time (second)

electric current (ampere)

thermodynamic temperature (kelvin)

amount of substance (mole)

luminous intensity (candela).