A tungsten evaporation boat is a container that holds the material to be evaporated and provides a controlled environment for evaporation. It is heated using an electric current, causing the material to evaporate and form a vapor cloud, which then condenses onto a substrate, creating a film or coating. Tungsten was chosen as the boat material for its high melting point and low vapor pressure, ensuring efficient heating and uniform evaporation. The boats have excellent resistance to chemical reactions, maintaining material purity during deposition. They come in various sizes and shapes, with additional features like grooves for enhanced vaporization. Tungsten evaporation boats are widely used in electronics, optics, and thin film coating industries, allowing for precise control and reproducibility. Careful handling is necessary due to tungsten's brittleness.