Agate is good protective energy stone, especially for children, and is very calming and soothing. It also can help strengthen the body's connection to the earth.
The friction factor, f, is a dimensionless factor that depends primarily on the velocity u, diameter D, density Ï, and viscosity Î·. It is also a function of wall roughness which depends on the size Îµ, spacing Îµ' and shape of the roughness elements characterized by Îµ''.
Wikipedia. pull factor â(plural pull factors). 1  The lure of another home, country, region, organization, or religion. 2  1853, Bijdragen tot de taal-, land-en volkenkunde van Nederlandsch-Indie, IndiÃ«. M, nijhoff page,  136