Pressure

(prěsh'yūr.) [FromL. pres sus, compre ed.] (Statics.) A force counteracted by another force, so that no motion is produced. When a body is laid on an horizontal table, its weight will be counteracted by the resistance of the table; this resistance is a pre ure. A pre ure tending to compre the body on which it acts is termed a thrust when applied from without, and a reaction when called into existence by a thrust. When abo dy is acted on by two equal and opposite pre ures which tend to produce elongation, ench is termed a strain or tension, the former term being used when the body is inflexible, the latter when it is flexible. Thus we speak of the strain of a tie beam and the tension of acord. Pre '-work, (-würk.) (Printing.) The operation of taking impre ions from type by means of the pre , distinguished from composing, or the arrangement of | the types previous to their entering the pre . [s. 730]