to calculate the variable costs
81Aeroponics — is the process of growing plants in an air or mist environment without the use of soil or an aggregate medium. Aeroponic culture differs from both hydroponics and in vitro (Plant tissue culture) growing. Unlike hydroponics, which uses water as a… …
82hydrologic sciences — Introduction the fields of study concerned with the waters of the Earth. Included are the sciences of hydrology, oceanography, limnology, and glaciology. In its widest sense hydrology encompasses the study of the occurrence, the… …
83Analog sound vs. digital sound — Analog sound versus digital sound compares the two ways in which sound is recorded and stored. Actual sound waves consist of continuous variations in air pressure. Representations of these signals can be recorded in either digital or analog… …
84Mandelbrot set — Initial image of a Mandelbrot set zoom sequence with a continuously coloured environment …
85Pluto — This article is about the dwarf planet. For other uses, see Pluto (disambiguation). Pluto   …
86Municipal bond — Financial markets Public market Exchange Securities Bond market Fixed income Corporate bond Government bond Municipal bond …
87Comorbidity — In medicine, comorbidity is either the presence of one or more disorders (or diseases) in addition to a primary disease or disorder, or the effect of such additional disorders or diseases. Contents 1 In medicine 1.1 Charlson index 1.2 Diagnosis… …
88French tarot — Infobox CardGame title = French Tarot subtitle = A trick taking game of the European Tarot card game family image link = image caption = A 15 card hand of French Tarot for the 5 player variant alt names = Tarot, Jeu de Tarot type = trick taking… …
89EROEI — In physics, energy economics and ecological energetics, EROEI (Energy Returned on Energy Invested), ERoEI, EROI (Energy Return On Investment) or less frequently, eMergy, is the ratio of the amount of usable energy acquired from a particular… …
90Wood drying — (also seasoning lumber or timber seasoning) refers to reducing the moisture content of wood prior to its use. For some purposes wood is not dried at all (it is used green ) [http://en.wikipedia.org/wiki/Green wood] . Often the wood needs to be in …
