Columbia Encyclopedia

Search results

500 results found

fluid mechanics

(Encyclopedia)fluid mechanics, branch of mechanics dealing with the properties and behavior of fluids, i.e., liquids and gases. Because of their ability to flow, liquids and gases have many properties in common not...

Imitation of Christ, The

(Encyclopedia)Imitation of Christ, The, Christian devotional book, of great popularity. It originated among the Brothers of the Common Life in the Netherlands and was written probably c.1425. Tradition (since c.144...

balance of payments

(Encyclopedia)balance of payments, balance between all payments out of a country within a given period and all payments into the country, an outgrowth of the mercantilist theory of balance of trade. Balance of paym...

physical chemistry

(Encyclopedia)physical chemistry, branch of science that combines the principles and methods of physics and chemistry. It provides a fundamental theoretical and experimental basis for all of chemistry, including or...

philosophy of science

(Encyclopedia)philosophy of science, branch of philosophy that emerged as an autonomous discipline in the 19th cent., especially through the work of Auguste Comte, J. S. Mill, and William Whewell. Several of the is...

absolute zero

(Encyclopedia)absolute zero, the zero point of the ideal gas temperature scale, denoted by 0 degrees on the Kelvin and Rankine temperature scales, which is equivalent to −273.15℃ and −459.67℉. For most gase...

oil gas

(Encyclopedia)oil gas, any of a group of fuel gases produced from oil by exposing it to high temperatures. High-Btu oil gas is so called because of its high heating value; it is often used to supplement natural gas...

balance of trade

(Encyclopedia)balance of trade, relation between the merchandise exports and imports of a country. The concept first became important in the 16th and 17th cent. with the growth of mercantilism. Mercantilist theoris...

adsorption

(Encyclopedia)adsorption, adhesion of the molecules of liquids, gases, and dissolved substances to the surfaces of solids, as opposed to absorption, in which the molecules actually enter the absorbing medium (see a...

jet propulsion

(Encyclopedia)CE5 Types of jet engines: In the propeller-driven turbine a stream of high-velocity gases provides the power to drive the turbine and turn the propeller. In the jet-driven turbine the stream of gas...