International systemof units Si onit
UNITS AND MEASUREME NTS
Least coont esolution)
F PS MKS Physical Guantities ASurement an
ts the smallest ee
Cent1me ter foot metre Ins trument can
measure
"FuNDAMENTAL DERIvED detexmined
M 9ram
|T seco nd
pound k1loqram
second second OR BASE qntyl1) QoANTITY
Maximum permissible
by the Lt o an
erroris
instrument
- independent -dependent
on Fa Instrument LC
veloe1ty,dens1 ty etc mmstale |mm
SiaNIFCANT Fibi URES BASE QUANTITY
Non deumal no 1st non zero- last non zero
UNIT sYMBOL vernier 0mm
call1pers
DeCimal no - 1st non zero -till end QLength metre m
9uage
00\mm
Powers are not counted as SF
JMass |kiloqram kg
Exact numbevs have ntinte sF LCerror accoray
ol SF Time second and precehon
Changing9 unt will not change no
Electric g ampere
2.000 m 4 SF
cUrren t I Acuracy- degree of close ness
and
5100 25F betweena measuUTe ment
54002SF(onit ollonotmeo change) Temperature[)ketvin Hs true value
mol howclose
-90x102 ’35F
Ameont ot molmole Precison- refers to
50 students ’ SF ae to
15 m 2 5F and 15x 10em’2sF
substance repeated measusements
ed eachhother Resoloton of value
candela
LuminoUS
Intensity
certanoncertan
fqures Supplernentary quanttes (2)
2+1 fquresuncertan nthe Sf
1 is
aluay radian rad
angle
OiMENs1oLS QUANTILES
Plane
RoUNDIN 0FF
After deum al,no is < 5prev diqit same PMane are lenqth
1f no after det imal s >sinext digit angle adius
to the leftofs
If ts 5, check the diq1t same-below diqrt
it its even It emans
above diq1t
t its odd it ound off to
Eq: 157gE vound off to 3 diqtt Sol1d anqle steradion sr
16. asis 7 d no
sold intercepted area
15-5 vound off to 2 diqits angle (uadrei) Ainterepte d
A d dA area
5-38 = 5:4
7-364 =736
APPLIC ATION S oF PoH
ADDITIO N suBTRACTION OF SF deamal -To check if an equaton is dimenstonalls eovrect
1Check Least no of dqits after "To derive equatons contain1nq physical quantties
have s ame no of
a Answen should alo .T% eonvert a phy sicat quan tity from one vntt to another
decmal
dhg rts atler
$ciENTIFIC NOTATIONN FOR PowERRiqht deeimal -)
tq 2 +3:45+6189 = 439 =I1:4 decumal to left +)
1241+1345+450+18 = 1909q-5 Fermi (fm) 1o-15 m
1909(no decimal) Itonne = 1000 k9
1410 (rond off sr) 2 Angstrom (a) Iquintal l06 kq
t Nanome ter (nm) 0m 1amu = to1325 paoyN m
MuLTIPLICATIDND! VIS10N OF SF 1 mICron (Hm) 0m 1(un ar month= 195 days
of SFs
1 Check least no SFs
also have same
Ilghtyear (1y) q467Ki0' m tnano second 0 s
2 Anster should 1 A,staonomieal un1t (n) =r496x to'm DiMENSIONLESS aUNTITES
75
Eq 16 a35 xOal75= I76149 force = 1 dyne an cons system Triqonemetrie huntons
dyne9cms2
O-00435x 46 O 0a001 glem kglemxio? kgo Supple mentary quanttie s
kg l<m qlom10 kglm Relat1ve densrty
Density of water= tglem Re fractve index
km hr -’ m]s x5|18 Strain
PRINCIPLE oF HDMOGENEITY tates that
m]s km ]hr 18)5 femtof)-Io
onty quarnttes wth same dumensional ldm 1L 000ml
prco (p)
Imega (M) 10m
lom
formula can be adale or subtatted milltam pere) mA 16A qiga (61) 10 m
(micr oampeve) otoA
parsec 308x0 m26 ly
tpound o45 36 k9 I acYe 4047m
UNITS AND MEASUREME NTS
Least coont esolution)
F PS MKS Physical Guantities ASurement an
ts the smallest ee
Cent1me ter foot metre Ins trument can
measure
"FuNDAMENTAL DERIvED detexmined
M 9ram
|T seco nd
pound k1loqram
second second OR BASE qntyl1) QoANTITY
Maximum permissible
by the Lt o an
erroris
instrument
- independent -dependent
on Fa Instrument LC
veloe1ty,dens1 ty etc mmstale |mm
SiaNIFCANT Fibi URES BASE QUANTITY
Non deumal no 1st non zero- last non zero
UNIT sYMBOL vernier 0mm
call1pers
DeCimal no - 1st non zero -till end QLength metre m
9uage
00\mm
Powers are not counted as SF
JMass |kiloqram kg
Exact numbevs have ntinte sF LCerror accoray
ol SF Time second and precehon
Changing9 unt will not change no
Electric g ampere
2.000 m 4 SF
cUrren t I Acuracy- degree of close ness
and
5100 25F betweena measuUTe ment
54002SF(onit ollonotmeo change) Temperature[)ketvin Hs true value
mol howclose
-90x102 ’35F
Ameont ot molmole Precison- refers to
50 students ’ SF ae to
15 m 2 5F and 15x 10em’2sF
substance repeated measusements
ed eachhother Resoloton of value
candela
LuminoUS
Intensity
certanoncertan
fqures Supplernentary quanttes (2)
2+1 fquresuncertan nthe Sf
1 is
aluay radian rad
angle
OiMENs1oLS QUANTILES
Plane
RoUNDIN 0FF
After deum al,no is < 5prev diqit same PMane are lenqth
1f no after det imal s >sinext digit angle adius
to the leftofs
If ts 5, check the diq1t same-below diqrt
it its even It emans
above diq1t
t its odd it ound off to
Eq: 157gE vound off to 3 diqtt Sol1d anqle steradion sr
16. asis 7 d no
sold intercepted area
15-5 vound off to 2 diqits angle (uadrei) Ainterepte d
A d dA area
5-38 = 5:4
7-364 =736
APPLIC ATION S oF PoH
ADDITIO N suBTRACTION OF SF deamal -To check if an equaton is dimenstonalls eovrect
1Check Least no of dqits after "To derive equatons contain1nq physical quantties
have s ame no of
a Answen should alo .T% eonvert a phy sicat quan tity from one vntt to another
decmal
dhg rts atler
$ciENTIFIC NOTATIONN FOR PowERRiqht deeimal -)
tq 2 +3:45+6189 = 439 =I1:4 decumal to left +)
1241+1345+450+18 = 1909q-5 Fermi (fm) 1o-15 m
1909(no decimal) Itonne = 1000 k9
1410 (rond off sr) 2 Angstrom (a) Iquintal l06 kq
t Nanome ter (nm) 0m 1amu = to1325 paoyN m
MuLTIPLICATIDND! VIS10N OF SF 1 mICron (Hm) 0m 1(un ar month= 195 days
of SFs
1 Check least no SFs
also have same
Ilghtyear (1y) q467Ki0' m tnano second 0 s
2 Anster should 1 A,staonomieal un1t (n) =r496x to'm DiMENSIONLESS aUNTITES
75
Eq 16 a35 xOal75= I76149 force = 1 dyne an cons system Triqonemetrie huntons
dyne9cms2
O-00435x 46 O 0a001 glem kglemxio? kgo Supple mentary quanttie s
kg l<m qlom10 kglm Relat1ve densrty
Density of water= tglem Re fractve index
km hr -’ m]s x5|18 Strain
PRINCIPLE oF HDMOGENEITY tates that
m]s km ]hr 18)5 femtof)-Io
onty quarnttes wth same dumensional ldm 1L 000ml
prco (p)
Imega (M) 10m
lom
formula can be adale or subtatted milltam pere) mA 16A qiga (61) 10 m
(micr oampeve) otoA
parsec 308x0 m26 ly
tpound o45 36 k9 I acYe 4047m
