Spatial Measurement

The measurement of physical space has long been important. Geometry, the name given to the branch of mathematics which measures spatial relations, was popularised by the ancient Greeks, although earlier societies had developed measuring systems. The International System of Units, is now the most common system of units used in the measuring of space, and is almost universally used within science.

Geography is the branch of science concerned with identifying and describing the Earth, utilising spatial awareness to try and understand why things exist in specific locations. Cartography is the mapping of spaces to allow better navigation, for visualisation purposes and to act as a locational device. Geostatistics apply statistical concepts to collected spatial data in order to create an estimate for unobserved phenomena. Astronomy is the science involved with the observation, explanation and measuring of objects in outer space.

Bread

Bread is a staple food of European, Middle Eastern, Mexican and Indian cultures which is prepared by baking, steaming, or frying dough. Bread consists minimally of flour and water; salt is present in most cases; and usually a leavening agent such as yeast is used. Breads may also contain some amounts of sugar, spices, fruit, vegetables, nuts, or seeds. There are a wide variety of breads, with preferences differing from region to region.

Fresh bread is prized for its taste and texture, and retaining its freshness is important to keep it appetizing. Bread that has stiffened or dried past its prime is said to be stale. Modern bread is often wrapped in paper or plastic film, or stored in airtight containers such as a breadbox to keep it fresh longer. Bread that is kept in warm moist environments is prone to the growth of mold. It becomes stale more quickly in the low temperature of a refrigerator, although by keeping it cool, mold is less likely to grow. A way to keep bread longer is to put it in the freezer, preserving it for several weeks.

Medical genetics

Medical genetics involves the analysis and perceptive of human genetic diseases and syndromes. Physicians trained as geneticists are involved in diagnosing the presence of genetic disorders, as well as providing hereditary counseling to people carrying deleterious mutations. Researchers working in medical genetics seek to recognize the hereditary component of human diseases by finding and studying the involved genes and mutations.

Smoke

Smoke is a suspension in air of small particles resulting from incomplete combustion of a fuel. It is commonly an unwanted by-product of fires and fireplaces, but may also be used for pest control , communication , defense or inhalation of tobacco or other drugs. Smoke is sometimes used as a flavouring agent and preservative for various foodstuffs. Smoke is also sometimes a component of internal combustion engine exhaust gas, particularly diesel exhaust.

Smoke inhalation is the primary cause of death in victims of indoor fires. The smoke kills by a combination of thermal damage, poisoning and pulmonary irritation caused by carbon monoxide, hydrogen cyanide and other combustion products.

Smoke particles are actually an aerosol of solid particles or liquid droplets that are close to the ideal range of sizes for Mie scattering of visible light. This effect has been likened to three-dimensional textured privacy glass—the smoke cloud does not obstruct an image, but thoroughly scrambles it.

In Physics

Space is one of the few fundamental quantities in physics, meaning that it cannot be defined via other quantities because there is nothing more fundamental known at present. Thus, similar to the definition of other fundamental quantities, space is defined via measurement. Currently, the standard space interval, called a standard meter or simply meter, is defined as the distance traveled by light in a vacuum during a time interval of 1/299792458 of a second. This definition coupled with present definition of time makes our space-time to be Minkowski space and makes special relativity theory to be absolutely correct by definition.

In classical physics, space is a three-dimensional Euclidean space where any position can be described using three coordinates. Special and general relativity uses space-time rather than space; space-time is modeled as a four-dimensional space with the time axis being imaginary in special relativity and real in general relativity, and currently there are many theories which use more than four-dimensional spaces.

Before Einstein's work on relativistic physics, time and space were viewed as independent dimensions. Einstein's discoveries have shown that due to relativity of motion our space and time can be mathematically combined into one symmetric object — space-time.