Dynamic Meteorology and Hydrography (Classic Reprint) - Softcover

Bjerknes, V.

Softcover

ISBN 10: 1332920950 ISBN 13: 9781332920952

Verlag: Forgotten Books, 2018

Inhaltsangabe

Excerpt from Dynamic Meteorology and Hydrography

The level surfaces must be carefully distinguished from the surfaces of equal height above or equal depth below sea-level. The intensity of gravity decreases from the pole to the equator. Consequently the unit-mass must be lifted higher at the equator than at the pole, if the same amount of work is to be performed, and thus the same level surface be attained. A surface of equal height above or of equal depth below sea-level must therefore cut through the system of level surfaces. The surface of equal height or depth is a slanting surface, which is not normal to the plumb-line, and on which equilibrium is not possible under the sole action of gravity. If the surfaces were hard and smooth a ball would remain in equilibrium on a level surface. But on a surface of equal height above sea-level it would roll in-the direction from the pole to the equator; and on a surface of equal depth below sea-level it would roll in the direction from the equator to the pole.

This property at once shows that the surfaces of equal height or depth are not suitable as coordinate surfaces in problems relating to the statics or the dynamics of the atmosphere or the sea. For this purpose only level surfaces are found suitable.

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Details zur Ausgabe

• Verlag: Forgotten Books
• Erscheinungsdatum: 2018
• Sprache: Englisch
• ISBN 10: 1332920950
• ISBN 13: 9781332920952
• Einband: Taschenbuch
• Anzahl der Seiten: 436
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