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Heat :: Heat (n.) A force in nature which is recognized in various effects, but especially in the phenomena of fusion and evaporation, and which, as manifested in fire, the sun's rays, mechanical action, chemical combination, etc., becomes directly known to us through the sense of feeling. In its nature heat is a mode if motion, being in general a form of molecular disturbance or vibration. It was formerly supposed to be a subtile, imponderable fluid, to which was given the name caloric..

Optogram :: Optogram (n.) An image of external objects fixed on the retina by the photochemical action of light on the visual purple. See Optography.

Actinometry :: Actinometry (n.) The measurement of the chemical or actinic energy of light.

Rancid :: Rancid (a.) Having a rank smell or taste, from chemical change or decomposition; musty; as, rancid oil or butter..

Bromine :: Bromine (n.) One of the elements, related in its chemical qualities to chlorine and iodine. Atomic weight 79.8. Symbol Br. It is a deep reddish brown liquid of a very disagreeable odor, emitting a brownish vapor at the ordinary temperature. In combination it is found in minute quantities in sea water, and in many saline springs. It occurs also in the mineral bromyrite..

Hermetically :: Hermetically (adv.) In an hermetical manner; chemically.

Molecule :: Molecule (n.) A group of atoms so united and combined by chemical affinity that they form a complete, integrated whole, being the smallest portion of any particular compound that can exist in a free state; as, a molecule of water consists of two atoms of hydrogen and one of oxygen. Cf. Atom..

Phlogiston :: Phlogiston (n.) The hypothetical principle of fire, or inflammability, regarded by Stahl as a chemical element..

Chemically :: Chemically (adv.) According to chemical principles; by chemical process or operation.

Chemolysis :: Chemolysis (n.) A term sometimes applied to the decomposition of organic substance into more simple bodies, by the use of chemical agents alone..

Sarcosin :: Sarcosin (n.) A crystalline nitrogenous substance, formed in the decomposition of creatin (one of the constituents of muscle tissue). Chemically, it is methyl glycocoll..

Composition :: Composition (n.) A mass or body formed by combining two or more substances; as, a chemical composition..

Resist :: Resist (n.) A substance used to prevent a color or mordant from fixing on those parts to which it has been applied, either by acting machanically in preventing the color, etc., from reaching the cloth, or chemically in changing the color so as to render it incapable of fixing itself in the fibers.. The pastes prepared for this purpose are called resist pastes..

Chemical :: Chemical (n.) A substance used for producing a chemical effect; a reagent.

Nucleus :: Nucleus (n.) A body, usually spheroidal, in a cell or a protozoan, distinguished from the surrounding protoplasm by a difference in refrangibility and in behavior towards chemical reagents. It is more or less protoplasmic, and consists of a clear fluid (achromatin) through which extends a network of fibers (chromatin) in which may be suspended a second rounded body, the nucleolus (see Nucleoplasm). See Cell division, under Division..

Nitrogen :: Nitrogen (n.) A colorless nonmetallic element, tasteless and odorless, comprising four fifths of the atmosphere by volume. It is chemically very inert in the free state, and as such is incapable of supporting life (hence the name azote still used by French chemists); but it forms many important compounds, as ammonia, nitric acid, the cyanides, etc, and is a constituent of all organized living tissues, animal or vegetable. Symbol N. Atomic weight 14. It was formerly regarded as a permanent noncon

Condense :: Condense (v. i.) To combine or unite (as two chemical substances) with or without separation of some unimportant side products.

Coagulate :: Coagulate (v. t.) To cause (a liquid) to change into a curdlike or semisolid state, not by evaporation but by some kind of chemical reaction; to curdle; as, rennet coagulates milk; heat coagulates the white of an egg..

Chemistry :: Chemistry (n.) An application of chemical theory and method to the consideration of some particular subject; as, the chemistry of iron; the chemistry of indigo..

Dimorphous :: Dimorphous (a.) Crystallizing under two forms fundamentally different, while having the same chemical composition..

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