
·
2500BC
The first libraries and schools are built in Sumeria
· 2000BC Astronomy develops in Mesopotomia
·
1700BC
Earliest evidence of diagnostic medicine
in
·
450BC Scientific
specialization begins in
·
323BC The
first museum is built in
·
1169 Ibn-Rushd begins translating Aristotle's
works.
The Scientific Revolution
·
Begins in the
late 1500s and 1600s with establishment of the Scientific method – that natural laws could be derived from
experiment and observation, with practical results. Begins in astronomy and
physics.
·
The spread of
scientific knowledge was helped by the invention of the printing press in the
1400s
·
The findings of
Copernicus, Galileo, and others contradict Church doctrine and Aristotle,
leading to a conflict between theology
and science at the same time that the Counter-Reformation is occurring
·
1657 The
first scientific society is formed
in
·
1700s The Enlightenment is the term given in
·
1758 The
papal ban on Copernicus is lifted
·
1795 The metric system is developed in
·
1830s The
term “scientist” replaces “natural philosopher”.
·
Auguste Comte establishes the philosophy of “positivism”, where
scientific knowledge based on observation is “positive knowledge”, and all
other beliefs are superstitions.
·
1800
Positional notation is used in
·
1650 Amhose, an Egyptian scribe, compiles a book on Egyptian mathematics
·
120 Ptolemy
of
·
150 Modern numbers, the decimal system, and zero are developed in
·
190 The abacus (the first calculator) is invented in
·
820 Muhammad Al-Kwarzimi
of
·
c1200 Abacus
developed in
·
c. 1200 Arabic numerals replace Roman numerals in
·
1513 Plus and minus signs are used in
·
1601 Pierre
de Fermat (French mathematician) "Last Theorem" is not proved for
350 years
·
1614 John Napier discovers logarithms.
·
1621 The Slide Rule is invented in
·
1631 The
multiplication sign (x) is used in
·
1637 Rene Descartes develops analytical geometry
·
1642 Blaise Pascal develops the adding
machine
·
1665 Isaac
·
1684 Gottfried Wilhelm Leibniz's calculus published. 1673
Leibniz’ calculating machine.
·
1700 Bernoulli’s Theory of Probability
Social Sciences
Anthropology/Archaeology
·
1799 Rosetta Stone discovered in
·
1959 Mary and Louis Leakey discover hominid fossils
Sociology
·
Thorstein Veblen noted in
“The Theory of the Leisure Class”—the book in which he coined the phrase
“conspicuous consumption”—spending lavishly on expensive but essentially
wasteful goods and services is “evidence of wealth” and the “failure to consume
in due quantity and quality becomes a mark of inferiority and demerit.”

|
Unit Type |
Unit Name |
Symbol |
Derivation |
|
Length |
metre |
m |
1/299,792,458 of the
distance travelled by light in one second |
|
Area |
square metre |
|
m2 |
|
Volume |
cubic metre |
|
m3 |
|
Time |
second |
s |
9,192,631,770
periods of the radiation corresponding to the transition between two
hyperfine levels of the ground state of the Caesium
133 atom. |
|
Frequency |
hertz |
Hz |
s-1 |
|
Velocity |
metre per second |
|
m s-1 |
|
Acceleration |
metre per second squared |
|
m s-2 |
|
Mass |
kilogram |
kg |
The mass of a
Platinum-Iridium cylinder kept in |
|
Density |
kilogram per cubic meter |
|
kg m-3 |
|
Moment of Inertia |
kilogram square meter |
|
kg m2 |
|
Force / Weight |
newton |
N |
kg m s-2 |
|
Energy / Work / Torque |
joule |
J |
kg m2 s-2 (N m) |
|
Power |
watt |
W |
kg m2 s-3 (J s-1) |
|
Sound Intensity |
watt per square meter |
|
W m-2 |
|
Surface Tension |
newton per meter |
|
N m-1 |
|
Pressure |
pascal |
Pa |
N m-2 |
|
Compressibility |
square meter per newton |
|
m2 N-1 |
|
Temperature |
kelvin |
K |
1/273.16 of the
thermodynamic temperature at the triple point of water. |
|
Thermal Conductivity |
watt per metre per kelvin |
|
W m-1 K-1 |
|
Entropy / Heat Capacity |
joule per kelvin |
|
J K-1 |
|
Specific Heat Capacity |
joule per kilogram per kelvin |
|
J kg-1 K-1 |
|
Amount
of Substance |
mole |
mol |
The amount of
substance which contains as many elementary units as there are atoms in 12
grams of pure Carbon 12 |
|
Luminous
Intensity |
candela |
cd |
The luminous
intensity, in the perpendicular direction, of a surface of 1/60 square centimetre of a black body at the freezing temperature of
Platinum under a pressure of 101,325 pascal (1
atmosphere). |
|
Solid
Angle |
steradian |
sr |
The solid angle
subtended at the centre of a sphere of radius r by a portion of the surface
of the sphere having an area r2. |
|
Electric
Current |
ampere |
A |
The amount of
current that if maintained in two parallel rectilinear conductors (of
infinite length and negligible circular cross-section) placed 1 metre apart in a vacuum, would
produce a force between these conductors equal to 2 × 10-7 newton per metre. |
|
Magnetic Field Strength |
ampere per metre |
|
A m-1 |
|
Electric Charge |
coulomb |
C |
A s |
|
Potential Difference |
volt |
V |
kg m2 s-3 A-1 |
|
Electric Field Strength |
volt per meter |
|
V m-1 |
|
Thermoelectric Power |
volt per kelvin |
|
V K-1 |
|
Magnetic Flux |
weber |
Wb |
V s |
|
Inductance |
henry |
H |
Wb A-1 |
|
Permeability |
henry per meter |
|
H m-1 |
|
Flux Density |
tesla |
T |
kg s-2 A-1 |
|
Resistance / Impedance |
ohm |
W |
V A-1 |
|
Resistivity |
ohm meter |
|
V A-1 m |
|
Capacitance |
farad |
F |
A2 s4 kg-1 m-2 |
|
Permittivity |
farad per meter |
|
F m-1 |
|
Conductance |
siemens |
S |
F s-1 |
|
Electrical Conductivity |
siemens per meter |
|
S m-1 |
|
Molar Conductivity |
siemens square meter per
mole |
|
S m2 mol-1 |
|
Angle |
radian |
rad |
The angle subtended
at the centre of a circle by an arc of the circumference equal in length to
the radius of the circle. |
|
Prefix Name |
Symbol |
Multiple |
|
tera |
T |
1012 |
|
giga |
G |
109 |
|
mega |
M |
106 |
|
kilo |
k |
103 |
|
centi |
c |
10-2 |
|
milli |
m |
10-3 |
|
micro |
µ |
10-6 |
|
nano |
n |
10-9 |
|
pico |
p |
10-12 |
|
femto |
f |
10-15 |
|
atto |
a |
10-18 |
|
Quantity |
Symbol |
Value |
|
Velocity of light in a
vacuum |
c |
2.997 925 × 108
m s-1 |
|
Boltzmann Constant |
k |
1.380 54 × 10-23
J K-1 |
|
Planck Constant |
h |
6.625 59 × 10-34
J s |
|
Gravitational Constant |
G |
6.673 × 10-11 N
m2 kg-2 |
|
Acceleration of gravity |
g |
9.806 65 m s-2 |
|
Stefan Constant |
|
5.670 3 × 10-8J
K-4 m-2 s-1 |
|
Faraday Constant |
F |
9.648 70 × 104
C mol-1 |
|
Avogadro Constant |
L |
6.022 52 × 1023
mol-1 |
|
Charge on an electron |
e |
1.602 10 × 10-19
C |
|
Rest mass of electron |
me |
9.109 08 × 10-31
kg |
|
Hubble Constant |
H |
2.5 × 10-18 m s-1
m-1 |
|
Gas Constant |
R |
8.314 34 J K-1
mol-1 |

Revised: 10/4/06