The chemical name for baking soda is sodium bicarbonate. SK Innovation’s battery business, not included in the chemical results that make up C&EN’s survey, has been growing rapidly. However, if you have sensitive skin, you’ll want to avoid coarse particles and opt for microbeads or chemical exfoliating soap instead. If you want a bagged vacuum cleaner, this one is a great choice, but those who want a few more accessories in the box, particularly pet owners, may want to look elsewhere. Because we always want to know how fast something will go, people have been racing riding lawn mowers in the United States since 1992. At 20 races around the country each year, riding lawn mowers chase each other around a course under the banner of the United States Lawn Mower Racing Association. The rider guides the mower while sitting on top of its deck. In addition to other controls, the rider can also lower or raise the blade, speed it up or slow it down.

But four-cycle motors produce more torque for their size, which helps you push through taller grass without slowing down the blade. After the vinegar solution has had time to break down the lime buildup, scrub away with an abrasive material such as steel wool or scouring pads in a circular motion, followed by a thorough rinse with warm water. If you run across a coin that needs to soak for a while to get clean, put it in the tub of water off to the side, so you don’t accidentally ding it with another coin in the tub. The phospholipids arrange themselves in a two-layer lipid sandwich with the polar heads sticking into water and the polar tails sticking near each other. Keeping a sharp blade is an essential element to a properly working rotary lawn mower. The engine powers both the wheels and the blade, just like a walk-behind self-propelled mower.

For hilly lawns of up to one-half acre, a self-propelled walk-behind mower will do. One the small end, a riding mower with an engine of about 14 horsepower that can cut up to an acre starts at around $1,000. Most walk-behind rotary mowers cost less than $500, and the most basic riding mower starts at around $1,000 and goes up quickly from there. There are other costs associated with operating a lawn mower. There were no reports of gas during 1964, and only a few were reported in 1965. The reports grew more frequent in late 1966. On December 11, 1966, fifteen gas bombs killed two people and injured thirty-five. Only use fresh gasoline, and make sure you use two-cycle gas for a two-cycle engine and four-cycle gas for a four-cycle engine. Two-cycle motors are cheap and simple and produce more power for their given size than a four-cycle motor. Two-cycle motors are popular for lawn care tools such as trimmers, but four-cycle motors are the norm for lawn mowers.

They’re also more fuel-efficient, and they don’t burn oil and release as much pollution as two-cycle motors. Perhaps surprisingly, the basic technology hasn’t changed much since we last wrote about it in 2009, when then-President Barack Obama was taking heat from environmental groups for supporting clean coal. How about this one: The magnetic air car that was promised in 2008 and expected in 2010 never materialized — meaning that by 2012, this technology was vaporware., was creating a fuel-less car that used compressed air and magnets to power the vehicle. Change air filters after every 25 hours of operation. Silver heirlooms lend a luxurious touch to table settings, but over time, exposure to light and air can make the shiny finish appear dull or tarnished. Equipped with an 18 to 24 horsepower engine, a garden tractor can cost $9,000, but popular varieties cost $2,500 to $4,500. Lawns of 5 acres or more can require a full-size farm tractor to tow a mowing apparatus behind it. Some safety advocates recommend wearing steel-toed work shoes and safety goggles when mowing lawns. We facilitate work at onshore plants as well as offshore platforms, FPSOs and even on subsea piping.