Chemical Measurements Flashcards
SI units
French Système International d’Unités base units for which all others are defined
Length
meter -m
Distance light travels in a vacuum during 1/299,792,458 of a second
Mass
kilogram - kg
Mass of the prototype kilogram kept at Sèvres, France
Time
second - s
Duration of 9,192,631,770 periods of radiation corresponding to a certain atomic transition of 133Cs
Electric current
ampere - A
Produces a force of 2 x 10E-7 newtons per meter of length when maintained in two straight, parallel conductors of infinite length and negligible cross section, separated by 1 meter in a vacuum
Temperature
kelvin - K
Triple point of water (solid, liquid, and gaseous water are in equilibrium) is at 273.16 K, and the temperature of absolute zero is 0 K
Luminous intensity
candela - cd
Measure of luminous intensity visible to the human eye
1 cd = luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 x 10^12^ Hz and of which the radiant intensity in that direction is 1/683 watt per steradian
Amount of substance
mole - mol
Number of atoms in exactly 0.012 kg of 12C (approximately 6.022 x 10^23^)
Plane angle
radian - rad
2 pi radians in a circle
Solid angle
steradian - sr
4 pi radians in a sphere
Frequency
hertz - Hz
s^-1^
Force
newton - N
m kg s^-2^
Pressure
pascal - Pa
N m^-2^
kg m^-1^ s^-2^
Energy, work, quantity of heat
joule - J
N m^-1^
m^2^ kg s^-2^
Power, radiant flux
watt - W
J s^-1^
m^2^ kg s^-3^
Quantity of electricity, electric charge
coulomb - C
s A
Electric potential, potential difference, electromotive force
volt - V
W A^-1^
m^2^ kg s^-3^ A^-1^
Electric resistance
ohm - Ω
V A^-1^
m^2^ kg s^-3^ A^-2^
yotta
Y
E24
zetta
Z
E21
exa
E
E18
peta
P
E15
tera
T
E12
giga
G
E9
