Fluid
having the parts easily separable; consisting of particles which move and change their relative lative positions very readily; capable of flowing; liquid; gaseous. The fundamental property of fluids, viewed as forces, in physics, is their equality of pressure in all directions. The term includes both liquids and gases. Elastic fluids: In physics, gases. Electric or electrical fluid: In electricity, a fluid composed, in the opinion of Symmer, now generally accepted, of two fluids, the positive and the negative. Imponderable fluids: In physics, a name sometimes given to heat, light, magnetism, and electricity. They are mobile and yet, if consisting of matter, are in such a state of tenuity that they possess no perceptible weight. Magnetic fluids: In magnetism, two fluids assumed to exist. They are called respectively the N. or boreal fluid and the S. or austral fluid, the former predominating at the N. and the latter at the S. pole of the magnet. Sometimes the N. fluid is called the positive, and the S. fluid the negative one. Ponderable fluids: In physics, those possessed of weight; as water and carbonic acid gas.