Density, on the other hand, defined as the mass per unit volume of a material, depends on how tightly the molecules are packed together.
The main problem for me was to find in a mass of fascinating material a novel-shaped story, by which I mean a story that has more cohesion and patterning than the faithful chronicle of a life can usually provide.
Specific heat of solid materials (defined as heat absorbed per unit mass per degree change in temperature) is generally measured by the drop method, which involves adding a known mass of the material at a known elevated temperature to a known mass of water at a known low temperature and determining the equilibrium temperature of the mixture that results.
Reporting, even the most factually sound, is never free of interpretation; a story, especially an important one, involves sculpting from a mass of raw material, to give it a truthful shape.
It was the work of an editor who sorted through this considerable mass of material, an editor who probably spent as much time collecting, deciphering and organizing these missives as Lowell did writing them.
The effort is detailed in one tiny part of a mass of archival material made public on Thursday by the New York Philharmonic, the first phase of a project to put most of its vast archives on the Internet.
The Life of Charlotte Brontë (1857), written with warmhearted admiration, disposed of a mass of firsthand material with unforced narrative skill.
The initial dye concentration of an effluent is important since a given mass of sorbent material can only adsorb a fixed amount of dye (Benaïssa 2005).
Mr. Pagden, the author of "Peoples and Empires" and "European Encounters With the New World," embeds a few basic points about Eastern and Western political cultures in a great mass of historical material, then appends a polemical coda arguing against the idea that Western beliefs about freedom, democracy and secularism can ever be transplanted to the Middle East.
The other major assembly method is implosion, in which a subcritical mass of fissile material is compressed by a chemical high explosive into a denser critical mass.
