Wood | Properties, Production, Uses, & Facts | Britannica
2025年1月8日 · wood, the principal strengthening and nutrient-conducting tissue of trees and other plants and one of the most abundant and versatile natural materials. Produced by many botanical species, including both gymnosperms and angiosperms, wood is available in various colours and grain patterns.
Wood - Strength, Structure, Uses | Britannica
2025年1月8日 · Such wide application is made possible by the versatility of wood and its many desirable qualities, such as high strength for its weight, workability, and aesthetic appeal. But wood also has certain undesirable characteristics.
Structure and properties of wood | Britannica
wood, Hard, fibrous material formed by the accumulation of secondary xylem produced by the vascular cambium. It is the principal strengthening tissue found in the stems and roots of trees and shrubs. Wood forms around a central core (pith) in …
Wood - Strength, Density, Hardness | Britannica
2025年1月8日 · Wood - Strength, Density, Hardness: Sensory characteristics include colour, lustre, odour, taste, texture, grain, figure, weight, and hardness of wood. These supplementary macroscopic characteristics are helpful in describing a piece of …
Wood - Harvesting, Uses, Structure | Britannica
2025年1月8日 · Wood - Harvesting, Uses, Structure: Harvesting of wood differs radically from harvesting of other crops. The yearly growth of each individual tree cannot be detached from the living plant.
Wood - Cellulose, Lignin, Tracheids | Britannica
2025年1月8日 · Wood - Cellulose, Lignin, Tracheids: The microscope reveals that wood is composed of minute units called cells. According to estimates, 1 cubic metre (about 35 cubic feet) of spruce wood contains 350 billion–500 billion cells.
Wood - Bark, Bark Products, Uses | Britannica - Encyclopedia …
2024年11月13日 · Like wood, bark is anisotropic with regard to dimensional stability and strength. Thermal properties and heating value are similar to those of wood. Bark can be used in products such as particleboard and fibreboard, and small amounts are tolerated in semichemical and kraft pulping processes.
Wood - Treatments, Structure, Properties | Britannica
2024年11月13日 · Proper drying reduces the magnitude of dimensional changes due to shrinkage and swelling, protects wood from microorganisms, reduces weight and transportation costs, better prepares wood for most finishing and preservation methods, and increases its strength.
Wood - Uses, Structure, Properties | Britannica
2024年11月13日 · Wood - Uses, Structure, Properties: This section discusses the products of primary mechanical processing of wood—roundwood products (e.g., poles and pilings), sawn wood (primarily lumber), veneer, plywood and laminated …
The anatomy and organization of wood - Encyclopedia Britannica
2024年12月12日 · Tree - Anatomy, Organization, Wood: Wood is characterized by the axial and radial structures derived from the fusiform and ray initials. The radial system transports carbohydrates from the inner bark to the wood.