Here are definitions for each of the terms you provided:

Tank: A tank is a large container used for storing liquids or gases. In various contexts, it could refer to a storage vessel for water, fuel, chemicals, or other substances.

Pump: A pump is a mechanical device used to move fluids (liquids or gases) from one place to another. It works by creating suction or pressure to force the fluid through a system of pipes or hoses.

Hose reel: A hose reel is a cylindrical device used for storing and dispensing hoses. It typically consists of a drum or spool around which the hose is wound for storage and can be manually or mechanically operated to retract or extend the hose as needed.

Valve: A valve is a device that regulates or controls the flow of fluids (liquids, gases, or slurries) by opening, closing, or partially obstructing passages within a piping system. Valves are commonly used to start, stop, or regulate the flow of fluid and are essential components in various industries and applications.

Pressure: Pressure is the force exerted by a fluid (such as water or air) on the walls of its container or on any object immersed in it. It is typically measured in units such as pounds per square inch (psi) or pascals (Pa) and plays a critical role in fluid dynamics, hydraulic systems, and many other engineering applications.

Droplet size: Droplet size refers to the size of individual liquid particles (droplets) sprayed or dispersed from a nozzle or sprayer. It is an important parameter in various applications, including agricultural spraying, industrial coating, and medical inhalation therapy, as it can affect the coverage, efficiency, and effectiveness of the spraying process.

Wide-angle fogging: Wide-angle fogging refers to a spraying technique that produces a fine mist or fog of liquid droplets over a wide area. It is commonly used in firefighting, pest control, disinfection, and other applications where broad coverage is required.

Pencil stream: A pencil stream is a narrow, focused jet of fluid (such as water or air) that emerges from a nozzle or sprayer. It is characterized by its high velocity and concentrated flow pattern, resembling the shape of a pencil.

Air currents: Air currents are natural movements or flows of air in the atmosphere. They are driven by factors such as temperature differences, atmospheric pressure gradients, and the rotation of the Earth and play a crucial role in weather patterns, climate dynamics, and the dispersion of airborne particles.

Tree implantation or injection technology: Tree implantation or injection technology refers to methods used to deliver nutrients, pesticides, fertilizers, or other substances directly into trees through injections or implants. It is commonly employed in arboriculture, forestry, and horticulture to treat diseases, pests, or nutrient deficiencies in trees while minimizing environmental impact and optimizing effectiveness.

Yellow caution tape or construction safety tape is a visual warning, marking dangerous areas as well as construction zones.

A tank is an armored fighting vehicle intended as a primary offensive weapon in front-line ground combat.

According to President Theodore Roosevelt, Rainbow Bridge is a triumphal arch rather than a bridge and spans the torrent bed in a majesty never shared by any arch ever
reared by the mightiest conquerors among the nations of mankind" (Roosevelt, A Book-Lover's Holidays in the Open); according to MLA formatting guidelines, is a proper in-text citation.