Why Do “Left” And “Right” Mean Liberal And Conservative? Laboratory measurements of room temperature glass flow do show a motion consistent with a material viscosity on the order of 1017–1018 Pa s.[5][10], For melt quenching, if the cooling is sufficiently rapid (relative to the characteristic crystallization time) then crystallization is prevented and instead the disordered atomic configuration of the supercooled liquid is frozen into the solid state at Tg. [124] These systems use stainless steel fittings countersunk into recesses in the corners of the glass panels allowing strengthened panes to appear unsupported creating a flush exterior. These words are developed from glasan. The metaphor was first coined by feminists in reference to barriers in the careers of high-achieving women. [46] While women have historically dominated the teaching profession, men tend to take higher positions in school systems such as deans or principals. [70], Sodium carbonate (Na2CO3, "soda") is a common additive and acts to lowers the glass-transition temperature. Wentling, Rose Mary. Henricksen tore his glasses from his eyes, and emerging from the tent, groped on the desk for the weapon he had left there. These and other optical properties can be controlled by varying chemical compositions, thermal treatment, and manufacturing techniques. [16][17][18] At the same time, according to the April 3, 2015, Wall Street Journal, completely independent of Loden, the term glass ceiling was coined in the spring of 1978 by Marianne Schriber and Katherine Lawrence at Hewlett-Packard.

[41] The stereotypes and perceptions of women are changing slowly across the world, which also reduces gender segregation in organizations. For many applications polymer glasses are a lighter alternative to traditional silica glasses. [44] Similarly, laminated glass has been widely applied to vehicles for windscreens. This type of glass-ceramic exhibits excellent mechanical properties and can sustain repeated and quick temperature changes up to 1000 °C. Retrieved 2016-05-01, This page was last edited on 15 October 2020, at 16:50. This ability can be predicted by the rigidity theory.

[16] Vitrification of quartz can also occur when lightning strikes sand, forming hollow, branching rootlike structures called fulgurites.

Glass′iness.—adj. [18] Edeowie glass, found in South Australia, is proposed to originate from Pleistocene grassland fires, lightning strikes, or hypervelocity impact by one or several asteroids or comets. These hiring practices eliminate "the glass ceiling" because there is no more competition of capabilities and discrimination of gender. Definitions include: a made up sexual maneuver in which a person places saran wrap on their face, and another person defecates on the saran wrap. [41][56] Although generally transparent to visible light, glasses may be opaque to other wavelengths of light.
[69] Lead oxide also facilitates solubility of other metal oxides and is used in colored glass. [53] Refractive index may be modified by high-density (refractive index increases) or low-density (refractive index decreases) additives. "Women In Middle Management: Their Career Development And Aspirations." "Climbing The Corporate Ladder: Do Female And Male Executives Follow The Same Route?." [4][5], Glass can form naturally from volcanic magma.