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metically sealed at the upper, such as is used in the barometer. -- Torricellian vacuum (Physics), a vacuum produced by filling with a fluid, as mercury, a tube hermetically closed at one end, and, after immersing the other end in a vessel of the same fluid, allowing the inclosed fluid to descend till it is counterbal…

of a pair of equal and opposite couples which tend to twist a body. -- Torsion balance (Physics.), an instrument for estimating very minute forces, as electric or magnetic attractions and repulsions, by the torsion of a very slender wire or fiber having at its lower extremity a horizontal bar or needle, upon which th…

tapitaka [Pali] , or Basket of Discourses; and Abhidhammapitaka [Pali] , or Basket of Metaphysics.

nly one thread, wire, fiber, or the like; as, unifilar suspension. Unifilar magnetometer (Physics), an instrument which consists of a magnetic bar suspended at its center of gravity by a long thread, constituting a delicate means for accurately measuring magnetic intensities, also for determining declinations of the ma…

eated discharges, the amount of electricity passed into the larger jar. -- 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…

s of application, -- first used by Clausius in the investigation of problems in molecular physics.

or effect, incapable of confirmation or ratification; null. Cf. Voidable, 2. Void space (Physics), a vacuum.

d respectively by the specific gravity of the substance in question. -- Specific volume (Physics & Chem.), the quotient obtained by dividing unity by the specific gravity; the reciprocal of the specific gravity. It is equal (when the specific gravity is referred to water at 4º C. as a standard) to the number of cubic…

r excitement of thought, feeling, or energy; a tide; as, waves of enthusiasm. Wave front (Physics), the surface of initial displacement of the particles in a medium, as a wave of vibration advances. -- Wave length (Physics), the space, reckoned in the direction of propagation, occupied by a complete wave or undulation…

ht, Light weight, etc. See under Dead, Feather, etc. -- Weight of observation (Astron. & Physics), a number expressing the most probable relative value of each observation in determining the result of a series of observations of the same kind.

ous species of rotifers having a ciliated disk at the anterior end. -- Wheel barometer. (Physics) See under Barometer. -- Wheel boat, a boat with wheels, to be used either on water or upon inclined planes or railways. -- Wheel bug (Zoöl.), a large North American hemipterous insect (Prionidus cristatus) which sucks t…

a. & n. from Whirl, v. t. Whirling table. (a) (Physics) An apparatus provided with one or more revolving disks, with weights, pulleys, and other attachments, for illustrating the phenomena and laws of centrifugal force, and the like. (b) A potter's wheel.

tlesnake root. See under Rattlesnake. -- White lie. See under Lie. -- White light. (a) (Physics) Light having the different colors in the same proportion as in the light coming directly from the sun, without having been decomposed, as by passing through a prism. See the Note under Color, n., 1. (b) A kind of firework…

his patience had nearly reached zero. Absolute zero. See under Absolute. -- Zero method (Physics), a method of comparing, or measuring, forces, electric currents, etc., by so opposing them that the pointer of an indicating apparatus, or the needle of a galvanometer, remains at, or is brought to, zero, as contrasted wi…