písku

Písku is a term that can refer to several things, most commonly a type of sand or gravel, particularly in Czech and Slovak languages. In a geological context, písek refers to loose granular material composed of finely divided rock and mineral particles. The composition of písek varies depending on the local rock sources and conditions, but the most common component is silica (silicon dioxide), usually in the form of quartz.

The size of písek particles is typically defined within a specific range. Geologists often use the Wentworth scale or similar classifications to categorize sediment grain sizes. Písek generally falls between very fine sand (0.0625 mm) and very coarse sand (2 mm). Materials coarser than this are classified as gravel, while finer materials are called silt or clay.

Písek has numerous applications. It is a fundamental component in the construction industry, used in concrete, mortar, and asphalt mixtures. It is also used in landscaping, for filtration systems, in the production of glass, and as a substrate in aquariums and terrariums. In some contexts, písek can also refer to a specific location or a surname. For example, there might be a village named Písek, or a person with the surname Písek. However, without further context, the primary meaning relates to granular material.