The stratosphere (/ËstrÃ¦tÉËsfÉªÉr, -toÊ-/) is the second major layer of Earth's atmosphere, just above the troposphere, and below the mesosphere. About 20% of the atmosphere's mass is contained in the stratosphere.
The chainsaw is a highly effective and efficient tree and branch cutting power tool. It works with an engine, referred to as a power head; powering a metal chain, driven by a centrifugal clutch, with a chain moving around a groove in the guide bar at fast speeds.
The size of the chainsaw is determined by piston displacement (cmÂ³) and engine power (hp and kW). PROFICIENCY AND EXPERIENCE Choose a smaller chainsaw with a less powerful engine if you are new to chainsaw work. A small saw is more manoeuvrable than a large one. If the chainsaw is too heavy, your hands and arms will tire, which in the long run represents a safety risk. WOOD TYPES AND SIZE OF TREES Choose a larger chainsaw with more power if you want to fell larger trees, especially hardwood. If the model is too small, this will subject the chainsaw to great strain and unnecessary wear.