Illustrations of the C.G.S. System of Units: With Tables of Physical ConstantsMacmillan and Company, 1891 - 220 páginas |
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Página 1
... Units and Derived Units . 1. THE numerical value of a concrete quantity is its ratio to a selected magnitude of the same kind , called the unit . Thus , if L denote a definite length , and the unit length , L ī is a ratio in the strict ...
... Units and Derived Units . 1. THE numerical value of a concrete quantity is its ratio to a selected magnitude of the same kind , called the unit . Thus , if L denote a definite length , and the unit length , L ī is a ratio in the strict ...
Página 2
... unit of velocity is commonly defined to be that velocity with which the unit length would be described in the unit time . When we specify a velocity as so many miles per hour , or so many feet per second , we in effect employ as the unit ...
... unit of velocity is commonly defined to be that velocity with which the unit length would be described in the unit time . When we specify a velocity as so many miles per hour , or so many feet per second , we in effect employ as the unit ...
Página 3
... length and time are called the fundamental units . Dimensions . 6. Let us now examine the laws according to which ... unit velocity , the unit length , and the unit time . The numerical value of V is to be equal to the numerical value of ...
... length and time are called the fundamental units . Dimensions . 6. Let us now examine the laws according to which ... unit velocity , the unit length , and the unit time . The numerical value of V is to be equal to the numerical value of ...
Página 4
... unit of acceleration . Then , since the numerical value of the acceleration A is the numerical value of the velocity V ... unit of acceleration varies directly as the unit of length , and inversely as the square of the unit of time ; and ...
... unit of acceleration . Then , since the numerical value of the acceleration A is the numerical value of the velocity V ... unit of acceleration varies directly as the unit of length , and inversely as the square of the unit of time ; and ...
Página 5
... length ( time ) 29 that the dimensions of the unit of acceleration * are unit of length ( unit of time ) 2 or 8. We have treated these two cases very fully , by way of laying a firm foundation for much that is to follow . We shall ...
... length ( time ) 29 that the dimensions of the unit of acceleration * are unit of length ( unit of time ) 2 or 8. We have treated these two cases very fully , by way of laying a firm foundation for much that is to follow . We shall ...
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Términos y frases comunes
acceleration adopted atmosphere body C.G.S. system C.G.S. units capacity Carbonic Acid cell centimetre coefficient column compression Copper Crown 8vo cubic centim denoting density determinations difference of potential dimensions distance dynes dynes per square earth's edition elasticity electromotive force electrostatic unit employed equal equation equivalent ergs farad Fcap following table following values formula fundamental units gases given glass grammes gravity Hence Hydrogen inch index of refraction inductive intensity iron liquid longitudinal magnetic mercury metre millimetres multiplied Nitrous Oxide numerical value Oxide Peltier effect PHYSICS Platinum pressure Professor quantity of electricity quotient radius ratio Regnault shear Silver specific heat specific resistance specimen square centim standard stress substance sulphate sulphuric acid surface Temp temperature thermoelectric thermoelectric heights thermometer Thomson effect Trans unit of heat unit of length vacuo value of g velocity Viscosity volume wire Young's modulus Zinc
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Página 4 - A ratio of t ; and the numerical value — will vary inversely a as l, and directly in the duplicate ratio of t. In other words, the unit of acceleration varies directly as the unit of length, and inversely as the square of the unit of time; and the numerical value of a given acceleration varies inversely as the unit of length, and directly as the square of the unit of time. It will be observed that these have been deduced as direct consequences from the fact that [the numerical value of] an acceleration...
Página 213 - CGS" prefixed, these being the initial letters of the names of the three fundamental units. Special names, if short and suitable, would, in the opinion of a majority of us, be better than the provisional designations "CGS unit of . . . ." Several lists of names have already been suggested ; and attentive consideration will be given to any further suggestions which we may receive from persons interested in electrical nomenclature. The
Página 216 - September 22nd, 1881:— 1. For electrical measurements, the fundamental units, the centimetre (for length), the gramme (for mass), and the second (for time), are adopted. 2. The Ohm and the Volt (for practical measures of resistance and of electromotive force or potential) are to keep their existing definitions, 102 for the Ohm, and 108 for the Volt.
Página 50 - ... large deformations without receiving a permanent set, is said to have wide limits of elasticity. A body which, like steel, opposes great resistance to deformation, is said to have large coefficients of elasticity. Any change in the shape or size of a body produced by the application of force to the body is called a strain; and an action of force tending to produce a strain is called a stress. When a wire of cross-section A is stretched with a force F, the...
Página 211 - FRS, and Professor EVERETT (Reporter). WE consider that the most urgent portion of the task intrusted to us is that which concerns the selection and nomenclature of units of force and energy ; and under this head we are prepared to offer a definite recommendation. A more extensive and difficult part of our duty is the selection and nomenclature of electrical and magnetic units. Under this head we are prepared with a definite recommendation as regards selection, but with only an interim recommendation...