Monday, 31 October 2011

Maths: KS3 - Metric Units (Measurement)

Today we are looking at metric units:

Length - Meter
Mass - Grams
Time - Minute
Liquid - Litre

Pico - trillionth
Nano - billionth
Micro - millionth
Milli - thousandth
Centi - hundredth
Deci - tenth
UNIT
Deka - ten
Hecto - hundred
Kilo - thousand
Mega - million
Giga - billion
Tera - trillion

See more here:  http://www.unc.edu/~rowlett/units/prefixes.html

http://en.wikipedia.org/wiki/SI_prefix


SI prefixes in everyday use
TextSymbolFactor
teraT1000000000000
gigaG1000000000
megaM1000000
kilok1000
hectoh100
(none)(none)1
centic0.01
millim0.001
microμ0.000001
nanon0.000000001



QuantityDimensionUnit and symbolEquivalence
MassMtonne (t)1000 kg
AreaL2hectare (ha)0.01 km2
104 m2
VolumeL3litre (L or l)0.001 m3
TimeTminute (min)
hour (h)
day (d)
60 s
3600 s
86400 s
PressureL − 1MT − 2bar100 kPa
Plane anglenonedegree (°)
minute (ʹ)
second (″)
(π180) rad
(π10800) rad
(π648000) rad


and here is some more useful info in a table format:





QuantityDimensionSI unit and symbolLegacy unit and symbolConversion
factor[68][69][70]
TimeTsecond (s)second (s)1
LengthLmetre (m)centimetre (cm)
ångström (Å)
0.01
10−10
MassMkilogram (kg)gram (g)0.001
AreaL2square metre (m2)are (are)100
AccelerationLT − 2(ms−2)gal (gal)10−2
Electric currentIampere (A)international ampere
abampere or biot
statampere
1.000022
10.0
3.335641×10−10
TemperatureΘkelvin (K)
degrees Celsius (°C)
centigrade (°C)K = °C + 273.15
1
Luminous intensityJcandela (cd)international candle0.982
Amount of substanceNmole (mol)No legacy unitn/a
FrequencyT − 1hertz (Hz)cycles per second1
EnergyL2MT − 2joule (J)erg (erg)10−7
PowerL2MT − 3watt (W)(erg/s)
horsepower (HP)
Pferdestärke (PS)
10−7
745.7
735.5
ForceLMT − 2newton (N)dyne (dyn)
sthene (sn)
kilopond (kp)
10−5
103
9.80665
PressureL − 1MT − 2pascal (Pa)barye (Ba)
pieze (pz)
atmosphere (at)
0.1
103
1.0197×10−5
Electric chargeITcoulomb (C)abcoulomb
statcoulomb or franklin
10
3.335641×10−10
Potential differenceL2MT − 3I − 1volt (V)international volt
abvolt
statvolt
1.00034
10−8
2.997925×102
CapacitanceL − 2M − 1T4I2farad (F)abfarad
statfarad
109
1.112650×10−12
InductanceL2MT − 2I − 2henry (H)abhenry
stathenry
10−9
8.987552×1011
Electric resistanceL2MT − 3I − 2ohm (Ω)international ohm
abohm
statohm
1.00049
10−9
8.987552×1011
Electric conductanceL − 2M − 1T3I2siemens (S)mho (℧)
abmho
statmho
0.99951
109
1.112650×10−12
Magnetic fluxL2MT − 2I − 1weber (Wb)maxwell (Mx)10−8
Magnetic flux densityMT − 2I − 1tesla (T)gauss (G)1×10−4
Magnetic field strengthIL − 1(A/m)oersted (Oe)103/4π = 79.57747
Dynamic viscosityML − 1T − 1(Pa·s)poise (P)0.1
Kinematic viscosityL2T − 1(m2s−1)stokes (St)10−4
Luminous fluxJlumen (lm)stilb (sb)104
IlluminanceJL − 2lux (lx)phot (ph)104
[Radioactive] activityT − 1bequerel (Bq)curie (Ci)3.70×1010
Absorbed [radiation] doseL2T − 2gray (Gy)roentgen (R)
rad (rad)
2.58×10−4
0.01
Radiation dose equivalentL2T − 2sievertroentgen equivalent man (rem)0.01
Catalytic activityNT − 1katal (kat)No legacy unitn/a


Ref:  http://en.wikipedia.org/wiki/Metric_system

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