Editing Silt (section)

=== Definitions ===
'''ASTM''' American Standard of Testing Materials: 200 sieve – 0.005&nbsp;mm.

'''USDA''' United States Department of Agriculture 0.05–0.002&nbsp;mm.

'''ISSS''' International Society of Soil Science  0.02–0.002&nbsp;mm.

Civil engineers in the United States define silt as material made of particles that pass a number 200 sieve (0.074&nbsp;mm or less) but show little plasticity when wet and little cohesion when air-dried.{{sfn|Jackson|1997|loc="silt [eng]"}} The International Society of Soil Science (ISSS) defines silt as soil containing 80% or more of particles between 0.002&nbsp;mm to 0.02&nbsp;mm in size{{sfn|Jackson|1997|loc="silt [soil]"}} while the U.S. Department of Agriculture puts the cutoff at 0.05mm.<ref>{{cite web |url=http://soils.usda.gov/technical/handbook/contents/part618.html#43 |title=Particle Size (618.43) |work=National Soil Survey Handbook Part 618 (42-55) Soil Properties and Qualities |publisher= - Natural Resource Conservation Service |access-date=2006-05-31 |url-status=dead |archive-url=https://web.archive.org/web/20060527111746/http://soils.usda.gov/technical/handbook/contents/part618.html#43 |archive-date=2006-05-27 }}</ref> The term ''silt'' is also used informally for material containing much sand and clay as well as silt-sized particles, or for mud suspended in water.{{sfn|Jackson|1997|loc="silt [sed]"}}