grain-size range

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• grain size control — when a steel is austenitised by heating to above the critical range, time is required for the production of a homogeneous structure during which there is a tendency towards grain growth. Although subsequent hot and cold working affect the grain… …   Mechanics glossary

• grain size scale — ▪ sedimentology  in sedimentology, division of a continuous range of particle sizes into a series of discrete groups. Several such scales have been devised for the purpose of standardizing terms and providing a basis for statistical analysis. On… …   Universalium

• Particle size (grain size) — Particle size, also called grain size, refers to the diameter of individual grains of sediment, or the lithified particles in clastic rocks. The term may also be applied to other granular materials. This is different from the crystallite size,… …   Wikipedia

• Grain boundary strengthening — (or Hall Petch strengthening) is a method of strengthening materials by changing their average crystallite (grain) size. It is based on the observation that grain boundaries impede dislocation movement and that the number of dislocations within a …   Wikipedia

• Grain boundary — A grain boundary is the interface between two grains in a polycrystalline material. Grain boundaries disrupt the motion of dislocations through a material, so reducing crystallite size is a common way to improve strength, as described by the Hall …   Wikipedia

• Particle size distribution — The particle size distribution [Jillavenkatesa A, Dapkunas S J, Lin Sien Lum, Particle Size Characterization , NIST Special Publication 960 1, 2001] (PSD) of a powder, or granular material, or particles dispersed in fluid, is a list of values or… …   Wikipedia

• Paper size — A size chart illustrating the ISO A series and a comparison with American letter and legal formats …   Wikipedia

• Free range — is a method of farming husbandry where the animals are allowed to roam freely instead of being contained in any manner. The term is used in two senses that do not overlap completely: as a farmer centric description of husbandry methods, and as a… …   Wikipedia

• sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …   Universalium

• agriculture, origins of — Introduction  the active production of useful plants or animals in ecosystems that have been created by people. Agriculture has often been conceptualized narrowly, in terms of specific combinations of activities and organisms wet rice production… …   Universalium

• igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium