| Zirconia | (english) ZrO2 an acid refractory up to 2500 B0C (4532 B0F) having good thermal shock resistance and low electrical resistively. |
| Zirconium | (english) Silvery-white, metallic element, mp 1860 B0C (3380 B0F), a powerful deoxidizer when added to molten steel. |
| Zn | (english) Chemical symbol for Zinc |
| Zr | (english) Chemical symbol for Zirconium |
| Acceleration: | (english) A vector quantity equal to the rate that velocity changes with time. |
| Axial force: | (english) A system of internal forces whose resultant is a force acting along the longitudinal axis of a structural member or assembly. |
| Bending moment: | (english) A system of internal forces whose resultant is a moment. This term is most commonly used to refer to internal forces in beams. |
| Body force: | (english) An external force acting throughout the mass of a body. Gravity is a body force. An inertial force is a body force. |
| Brittle: | (english) A brittle structure or material exhibits low ductility, meaning that it exhibits very little inelastic deformation before complete failure. |
| Center of Gravity (CG): | (english) The location of the resultant of gravity forces on an object or objects: sometimes called center of mass. |