Читать книгу Flight Theory and Aerodynamics - Joseph R. Badick - Страница 18

Mass is a measure of the amount of material contained in a body, usually measured in kilograms; we will use slugs as the unit in this textbook. Weight, on the other hand, is a force caused by the gravitational attraction of the earth (g = 32.2 ft/s²), moon, sun, or other heavenly bodies. Weight will vary depending on where the body is located in space (specifically, how far from the source of gravitational attraction), but mass will not vary with position.

(1.1)

Rearranging gives

This mass unit is called the slug.