Recognizing Impressionistic Art essays

Recognizing Impressionistic Art essays In terms of style it is relatively easy to recognize an Impressionist painting. There are certain characteristics that make this form of art stand out, such as the rough brush strokes and colors that often tend to blend into one another. However, in order to identify an Impressionist painting, who has to be aware of the underlying philosophy and intention of this style of art. In essence Impressionism was both a new style in the development of art and a new approach to the interaction between the artist and the subject. The most obvious characteristic that distinguishes an Impressionist painting from other styles and types of art can be derived from the word impression. The term Impressionistic was a description of this style which was intended as a critique by earlier critics. The first characteristic of an Impressionistic work of art is its deviance from the more objective and representational forms of art. The philosophy behind Impressionism was that the artist should capture a fleeing impression of nature; which was translated into art through a more casual and less photographic copy of nature or an object. Therefore an Impressionist painting is an attempt at creating a painting that captures the mood or feeling of a certain subject, rather than an exact copy. This also implies that Impressionistic art is more subjective in its approach and focuses on the interaction between the object being painted and the artists feelings or impressions. The Impressionists also tended to focus on scenes from nature, especially landscapes, and they tended to paint not in the studio but in the open air. In order to achieve these ideals the Impressionists used certain distinguishing techniques and this led to the artistic style that we associate with Impressionism. One of the first aspects that distinguish an Impressionist painting is the loose and short brush strokes. This is indicat...

The Difference Between Deflagration and Detonation

The Difference Between Deflagration and Detonation Combustion (burning) is a process by which energy is released. Deflagration and detonation are two ways energy may be released. If the combustion process propagates outward at subsonic speeds (slower than the speed of sound), its a deflagration. If the explosion moves outward at supersonic speeds (faster than the speed of sound), its detonation. While the action of deflagration is to push the air in front it, objects do not explode because the rate of combustion is relatively slow. Because the action of detonation is so rapid, however, detonations result in shattering or pulverizing objects in their path. Deflagration The definition of deflagration, according  to the Collins Dictionary is a fire in which a flame travels rapidly, but at subsonic speed, through a gas.  Deflagration  is an explosion in which the speed of burning is lower than the speed of sound in the surroundings. Everyday fire and most controlled explosions are examples of deflagration. The flame propagation velocity is less than 100 meters per second (usually much lower), and the overpressure is less than 0.5 bar. Because it is controllable, deflagration can be harnessed to do work. Examples of deflagrations include: internal combustion engine (used in any vehicle that uses fossil fuels such as gasoline, oil, or diesel fuel)gas stove (fueled with natural gas)fireworks and other pyrotechnicsgunpowder in a firearm Deflagration burns outward radially and requires fuel to spread. Thus, for example, a wildfire starts with a single spark and then expands in a circular pattern if there is fuel available. If there is no fuel, the fire simply burns out. The speed at which deflagration moves depends upon the quality of the available fuel. Detonation The word detonation means to thunder down, or explode. When a decomposition reaction or combination reaction releases a lot of energy in a very short span of time, an explosion may occur.  A detonation is a dramatic, often destructive form of an explosion. It is characterized by a supersonic exothermic front (in excess of 100 m/s up to 2000 m/s) and significant overpressure (up to 20 bars). The front drives a shockwave ahead of it. Although technically a form of oxidation reaction, a detonation doesnt require combination with oxygen. Unstable molecules release considerable energy when they split and recombine into new forms. Examples of chemicals that produce detonations include any high explosives, such as: TNT (trinitrotoluene)nitroglycerinedynamitepicric acidC4 Detonations, of course, can be used in explosive weapons such as nuclear bombs. They are also (in a much more controlled manner) in mining, road construction, and the destruction of buildings or structures.   Deflagration to Detonation Transition In some situations, a subsonic flame may accelerate into a supersonic flame. This deflagration to detonation is difficult to predict but occurs most often when eddy currents or other turbulence are present in the flames. This can happen if the fire is partially confined or obstructed. Such events have occurred in industrial sites where extremely combustible gasses have escaped, and when ordinary deflagration fires encounter explosive materials.