Permanent gases(Chem. & Physics), hydrogen, oxygen, nitrogen, and carbon monoxide; — also called incondensible or incoercible gases, before their liquefaction in 1877.Permanent way, the roadbed and superstructure of a finished railway; — so called in distinction from the contractor's temporary way.Permanent white(Chem.), barium sulphate (heavy spar), used as a white pigment or paint, in distinction from white lead, which tarnishes and darkens from the formation of the sulphide.

Syn. — Lasting; durable; constant. See Lasting.

(Per"ma*nent*ly), adv. In a permanent manner.

(Per*man"ga*nate) n. (Chem.) A salt of permanganic acid.

Potassium permanganate. (Chem.) See Potassium permanganate, under Potassium.

(Per`man*gan"ic) a. (Chem.) Pertaining to, or designating, one of the higher acids of manganese, HMnO4, which forms salts called permanganates.

(Per*man"sion) n. [L. permansio. See Permanent.] Continuance. [Obs.] Sir T. Browne.

(Per`me*a*bil"i*ty) n. [Cf. F. perméabilité.] The quality or state of being permeable.

Magnetic permeability(Physics), the specific capacity of a body for magnetic induction, or its conducting power for lines of magnetic force. Sir W. Thomson.

(Per"me*a*ble) a. [L. permeabilis: cf. F. perméable. See Permeate.] Capable of being permeated, or passed through; yielding passage; passable; penetrable; — used especially of substances which allow the passage of fluids; as, wood is permeable to oil; glass is permeable to light. I. Taylor.

(Per"me*a*bly), adv. In a permeable manner.

(Per"me*ant) a. [L. permeans, p. pr.] Passing through; permeating. [R.] Sir T. Browne.

(Per"me*ate) v. t. [imp. & p. p. Permeated ; p. pr. & vb. n. Permeating.] [L. permeatus, p. p. of permeare to permeate; per + meare to go, pass.]

1. To pass through the pores or interstices of; to penetrate and pass through without causing rupture or displacement; — applied especially to fluids which pass through substances of loose texture; as, water permeates sand. Woodward.

2. To enter and spread through; to pervade.

God was conceived to be diffused throughout the whole world, to permeate and pervade all things.

(Per"ma*nence Per"ma*nen*cy) n. [Cf. F. permanence.] The quality or state of being permanent; continuance in the same state or place; duration; fixedness; as, the permanence of institutions; the permanence of nature.

(Per"ma*nent) a. [L. permanens, -entis, p. pr. of permanere to stay or remain to the end, to last; per + manere to remain: cf. F. permanent. See Per-, and Mansion.] Continuing in the same state, or without any change that destroys form or character; remaining unaltered or unremoved; abiding; durable; fixed; stable; lasting; as, a permanent impression.

Eternity stands permanent and fixed.

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