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Chemical reactions such as combustion in fire, fermentation and the reduction of ores to metals were known since antiquity. Initial theories of transformation of materials were developed by Greek philosophers, such as the Four-Element Theory of Empedocles stating that any substance is composed of the four basic elements – fire, water, air and ...
Heraclitus regarded the soul as being a mixture of fire and water, with fire being the more noble part and water the ignoble aspect. He believed the goal of the soul is to be rid of water and become pure fire: the dry soul is the best and it is worldly pleasures that make the soul "moist". [ 7 ]
Once a fire has started, the resulting exothermic chain reaction sustains the fire and allows it to continue until or unless at least one of the elements of the fire is blocked: foam can be used to deny the fire the oxygen it needs; water can be used to lower the temperature of the fuel below the ignition point, or to remove or disperse the fuel.
Empedocles established four ultimate elements which make all the structures in the world—fire, air, water, earth. [ 6 ] [ h ] Empedocles called these four elements "roots", [ 7 ] which he also identified with the mythical names of Zeus , Hera , Nestis , and Aidoneus [ i ] (e.g., "Now hear the fourfold roots of everything: enlivening Hera ...
water or an aqueous solution and is termed water/oil (w/o) if the dispersed phase is water or an aqueous solution and the continuous phase is an organic liquid (an "oil"). Note 5: A w/o emulsion is sometimes called an inverse emulsion. The term "inverse emulsion" is misleading, suggesting incorrectly that
Timaeus describes the substance as a lack of homogeneity or balance, in which the four elements (earth, air, fire and water) were shapeless, mixed and in constant motion. Considering that order is favourable over disorder, the essential act of the creator was to bring order and clarity to this substance.
In the mix of conditions that have contributed to the most destructive fires in L.A. history, scientists say one significant ingredient is human-caused climate change. ... change is affecting fire ...
Alteration concerned itself with the ability for elements to change based on common and uncommon qualities. From this important work Aristotle gives us two of his most remembered contributions. First, the Four Causes and also the Four Elements (earth, wind, fire, and water).