length unit
time unit
temperature unit
meter
second
kelvin
centimeter
millimeter
micrometer
nanometer
angstrom
picometer
degree Celsius
millisecond
microsecond
picosecond
minute
hour
day
week
month
year
concentration unit
rotational frequency unit
unit of molarity
molar
millimolar
micromolar
nanomolar
picomolar
femtomolar
turns per second
frequency unit
hertz
nanosecond
century
half life
Typically applied to the half life of radioactive atoms but also applicable to any other situation where the population is of molecules of diminishing concentration or activity.
mass percentage
mass per unit volume
For units and further information look under the mass density unit. For a sample of a specific pure elemental substance, the concentration is directly proportional to the density. However, concentration is not proportional to density in general.
dimensionless unit
percent
ratio
degree Fahrenheit
In this scale, the freezing point of water is 32 degrees Fahrenheit and the boiling point is 212 degrees, placing the boiling and freezing points of water 180 degrees apart. -40 degrees Fahrenheit is equal to -40 degrees Celsius.
cell concentration unit
cells per milliliter
catalytic (activity) concentration unit
katal per cubic meter
katal per liter