Cloud cover such as the Amazon Rainforest and some others are almost always clear such as the Sahara Desert. Cloud cover Cloud cover (also known as cloudiness, cloudage, or cloud amount) refers to the fraction of the sky obscured by clouds when observed from a particular location. Okta is the usual unit of measurement of the cloud cover. The cloud cover is correlated to the sunshine duration as the least cloudy locales are the sunniest ones while the cloudiest areas are the least sunny places. The global cloud cover averages around 0.68 when analyzing clouds with optical depth larger than 0.1. This
Units of textile measurement pressure difference of 10 cm head of water", also known as the Gurley unit. Factors that affect air permeability include porosity, fabric thickness and construction, yarn density, twist, and crimp, layering, and moisture within the fabric. The concept of air permeability is important for the design of active wear and insect netting. The unit Martindale quantifies a textile's resistance to abrasion when used for upholstery. Units of textile measurement Textile fibers, threads, yarns and fabrics are measured in a multiplicity of units. Micronaire is a measure of the air permeability of cotton fiber and is an indication of fineness and