Columbia Encyclopedia

Search results

500 results found

aberration

(Encyclopedia)CE5 A. Spherical aberration: Light rays near the edge of the lens are bent more and brought to focus nearer to the lens. B. Chromatic aberration: Shorter wavelengths (higher frequencies) are bent m...

Green party

(Encyclopedia)Green party, any of the political parties established in various countries to oppose the destructive environmental effects of many modern technologies and the economic systems and institutions that dr...

probiotic

(Encyclopedia)probiotic, live microorganism administered to a host with the intention of providing a health benefit, or a food, supplement, or treatment containing such microorganisms. Many of the microbes found in...

radioactive isotope

(Encyclopedia)radioactive isotope or radioisotope, natural or artificially created isotope of a chemical element having an unstable nucleus that decays, emitting alpha, beta, or gamma rays until stability is reache...

Inness, George

(Encyclopedia)Inness, George ĭnˈĭs [key], 1825–94, American landscape painter, b. Newburgh, N.Y. His father intended Inness to be a grocer, but he showed artistic talent at an early age and was apprenticed to ...

intermolecular forces

(Encyclopedia)intermolecular forces, forces that are exerted by molecules on each other and that, in general, affect the macroscopic properties of the material of which the molecules are a part. Such forces may be ...

superfluidity

(Encyclopedia)superfluidity, tendency of liquid helium below a temperature of 2.19K to flow freely, even upward, with little apparent friction. Helium becomes a liquid when it is cooled to 4.2K. Special methods...

Taj Mahal

(Encyclopedia)Taj Mahal täzh məhälˈ, täj məhŭlˈ [key], mausoleum, Agra, Uttar Pradesh state, N India, on the Yamuna River. It is considered one of the most beautiful buildings in the world and the finest ex...

Sinclair, Upton

(Encyclopedia)Sinclair, Upton (Upton Beall Sinclair), 1878–1968, American novelist and socialist activist, b. Baltimore, grad. College of the City of New York, 1897. He was one of the muckrakers, and a dedication...

Burchfield, Charles

(Encyclopedia)Burchfield, Charles (Charles Ephraim Burchfield), 1893–1967, American painter, b. Ashtabula Harbor, Ohio, studied Cleveland School of Art. Living at first in Ohio, then moving (1921) to upstate New ...