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hich changes, or tends to change, any physical relation between them, whether mechanical, thermal, chemical, electrical, magnetic, or of any other kind; as, the force of gravity; cohesive force; centrifugal force. Animal force (Physiol.), muscular force or energy. -- Catabiotic force Etym: [Gr. (Biol.), the influence…

rk which can be done by it. It is approximately equal to the mechanical equivalent of the thermal unit divided by the number expressing the temperature in degrees of the air thermometer, reckoned from its zero of expansion. -- Circular functions. See Inverse trigonometrical functions (below). -- Continuous function,…

Warm-blooded; homoiothermal; hæmatothermal.

Poikilothermal.

An apparatus for the production of sound by the action of luminous or thermal rays. It is essentially the same as the photophone.

e burned or evaporated, each substance having its own characteristic system of lines. -- Thermal spectrum, a spectrum of rays considered solely with reference to their heating effect, especially of those rays which produce no luminous phenomena.

hysiol.), the nearly constant temperature maintained in the bodies of warm-blooded (homoiothermal) animals during life. The ultimate source of the heat is to be found in the potential energy of the food and the oxygen which is absorbed from the air during respiration. See Homoiothermal. -- Temperature sense (Physiol.)…

Of or pertaining to heat; due to heat; thermal; as, thermic lines. Thermic balance. See Bolometer. -- Thermic fever (Med.), the condition of fever produced by sunstroke. See Sunstroke. -- Thermic weight. (Mech.) Same as Heat weight, under Heat.

Of or relating to heat and electricity; especially, relating to thermal effects produced by voltaic action. Faraday.

-- Unit of heat (Physics), a determinate quantity of heat adopted as a unit of measure; a thermal unit (see under Thermal). Water is the substance generally employed, the unit being one gram or one pound, and the temperature interval one degree of the Centigrade or Fahrenheit scale. When referred to the gram, it is cal…

g a nearly uniform temperature whatever the temperature of the surrounding air. See Homoiothermal.