The New Encyclopaedia Britannica, Volumes 1-10Encyclopaedia Britannica, 1974 - Reference [1] Propaedia: outline of knowledge and guide to the Britannica.--[2]-[11] Micropaedia: ready reference and index.--[12]-[30] Macropaedia: knowledge in depth. |
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Page 293
... field surrounding the earth . But under all circumstances , whatever is described as a field must be measurable by some technique . If the observed quantity varies in space but does not change with time , the field is said to be static ...
... field surrounding the earth . But under all circumstances , whatever is described as a field must be measurable by some technique . If the observed quantity varies in space but does not change with time , the field is said to be static ...
Page 294
... field at r2 . Scalars . Fields can be classified according to whether the observable function f ( i.e. , the field quantity ) is a scalar , a vector , or a tensor . A scalar is ordinarily de- fined as a quantity having magnitude but no ...
... field at r2 . Scalars . Fields can be classified according to whether the observable function f ( i.e. , the field quantity ) is a scalar , a vector , or a tensor . A scalar is ordinarily de- fined as a quantity having magnitude but no ...
Page 1095
... fields from given ones . If ƒ is a real - valued function ( i.e. , a tensor field of order zero ) , its partial derivatives are the components of a covariant vector field called the gradient of f . If A is a covariant vector field ...
... fields from given ones . If ƒ is a real - valued function ( i.e. , a tensor field of order zero ) , its partial derivatives are the components of a covariant vector field called the gradient of f . If A is a covariant vector field ...
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The New Encyclopaedia Britannica, Volumes 1-10 Encyclopaedia Britannica Publishers, Inc. Staff No preview available - 1974 |
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