en.wikipedia.org/wiki/Parts-per_notation

In science and engineering, the parts-per notation is a set of pseudo-units to
describe small values of miscellaneous dimensionless quantities, e.g. mole
fraction or mass fraction. ... The unit “...

chemistry.stackexchange.com/questions/13673/what-is-defined-by-part-by-weight-in-the-definition-of-equivalent-weight

Jun 17, 2014 ... What is defined by part by weight in the definition of equivalent weight? ... What
does “parts by weight” or “parts by mass” specifically mean?

www.nesc.wvu.edu/ndwc/articles/ot/fa04/q&a.pdf

As a ppm is equal to mg/L, then ppb is equal to microgram ... Parts per million
also can be expressed as ... mass of a chemical or contami- nate per unit volume
...

www.reference.com/science/mass-mass-percent-concentration-solution-9c79df5326a180f5

A solution's mass-mass percent concentration is given as the mass of the solute
... The mass of the solution is equal to the mass of the solvent added to the mass
of the solute. Continue Reading. Keep Learning. How do you calculate molarity?
... When the two parts combine to make a solution, the properties of the solution ...

whatis.techtarget.com/definition/atomic-mass-unit-AMU-or-amu

An atomic mass unit (symbolized AMU or amu) is defined as precisely 1/12 the ...
The mass of an atom in AMU is roughly equal to the sum of the number of ... I'm
sure that someone can explain to me nuclear and molecular physics for free but ...

www.universetoday.com/114617/a-fun-way-of-understanding-emc2/

All this essentially means is that a Joule of energy is equal to the force used to
move a ... Well, here comes the fun part. ... Now that I'm in the right unit of
measure for mass, we can plug the values into the equation and see just what we
get:

chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Physical_Properties_of_Matter/Solutions_and_Mixtures/Solution_Basics/Units_Of_Concentration

Sep 13, 2016 ... The mass/volume percent is used to express the concentration of a ... It will have
an alcohol content of 75.5% (w/w) as per definition of "proof". ... Parts per Million:
A concentration of a solution that contained 1 g .... Also, keep in mind that the
sum of each of the solution's substances' mole frac...

www.greenfacts.org/glossary/pqrs/parts-per-billion.htm

Definition: A weight to weight ratio used to describe concentrations. Parts per
billion (ppb) is the number of units of mass of a contaminant per 1000 million
units of total mass. ... In that case 1 ppb equals 1 µg of substance per kg of solid (
µg/kg).

thinkmetric.org.uk/mass.html

For most things in everyday usage, they mean pretty much the same. ... The
kilogram is also divided into 1000 parts called grams. ... Your weight, also known
as body mass, can be measured in kilograms. ... metre, which was carefully
defined (see page on length) we can divide that into 100 equal parts, called
centimetres.