The no.of supplementary quantities in SI system are
Answers
Answer:
two
Explanation:
solid angle & one other
Answer:
The name Système International d'Unités (International System of Units) with the international abbreviation SI is a single international language of science and technology first introduced in 1960. SI is a coherent system based on the seven independent physical quantities (base units) and derived quantities (derived units). Note that since 1995 supplementary units have been abandoned and moved into the class of derived SI units.
Basic SI Units
Physical quantity quantity
symbol Basic SI
Unit Name Unit Symbol
length l, b, d, h, r, s, etc. metre m
mass m kilogram kg
time t second s
electric current I ampere A
thermodynamic temperature T kelvin K
amount of substance n mole mol
luminous intensity Iv candela cd
Table 1. SI base units.
Physical quantity Unit name Unit symbol Exp. in SI units
activity (of a radionuclide) curie Ci 3.7 x 1010 Bq
exposure
(x and γ rays) röntgen R 2.58 x 10-4 C kg s-1
absorbed dose rad rad cGy = 10-2 Gy
dose equivalent rem rem cSv = 10-2 Sv
length (x-ray wavelength) X unit - 1.002 x 10-4 nm
approximately
magnetic induction gamma γ nT = 10-9 T
flux, radio astronomy jansky Jy 10-26 W m-2 Hz-1
length fermi - fm = 10-15 m
mass metric carat - 200 mg = 2 x 10-4 kg
pressure torr Torr (101 325/760) Pa
pressure standard atmosphere atm 760 mmHg
= 101 325 Pa
pressure millimeter of mercury mmHg 133.322 39 Pa
energy thermochemical calorie calth 4.184 J
length micron µ 1 µm = 10-6 m
time year a 365.242199 days
= 31556925.9747 s
force kilogram-force kgf 9.80665 N
Table 9. Other Non-SI Units.
The table above lists units which are common in older texts and also some are units derived directly from a measurement system like barometric pressure measurement in mmHg. For current texts, it should be noted that if these units are used the advantages of the SI are lost. The relation of these units to the SI should be specified in every document in which they are used.
Prefixes for SI Units and Derived SI Units
Prefix-------- Symbol
-------------------------------------Factor-------------------
--------------- ----------
yotta Y 1 000 000 000 000 000 000 000 000 = 10 24 (e+24)
zetta Z 1 000 000 000 000 000 000 000 = 10 21 (e+21)
exa E 1 000 000 000 000 000 000 = 10 18 (e+18)
peta P 1 000 000 000 000 000 = 10 15 (e+15)
tera T 1 000 000 000 000 = 10 12 (e+12)
giga G 1 000 000 000 = 10 9 (e+9)
mega M 1 000 000 = 10 6 (e+6)
kilo k 1 000 = 10 3 (e+3)
hecto h 100 = 10 2 (e+2)
deca da 10 = 10 1 (e+1)
------------------ ------------ 1 -------------------------------------------------------------- --------------- ----------
deci d 0.1 = 10 -1 (e-1)
centi c 0.01 = 10 -2 (e-2)
milli m 0.001 = 10 -3 (e-3)
micro µ 0.000 001 = 10 -6 (e-6)
nano n 0.000 000 001 = 10 -9 (e-9)
pico p 0.000 000 000 001 = 10 -12 (e-12)
femto f 0.000 000 000 000 001 = 10 -15 (e-15)
atto a 0.000 000 000 000 000 001 = 10 -18 (e-18)
zepto z 0.000 000 000 000 000 000 001 = 10 -21 (e-21)
yocto y 0.000 000 000 000 000 000 000 001 = 10 -24 (e-24)