However, when you go to countries that use kilograms instead of pounds, knowing the conversion rate helps you know how much to purchase to get the same amount regardless of measurement scale. Knowing the cost per kilogram, instead of per pound, also helps you calculate how expensive it will ...
Bill Gates writes about simple, low-cost innovations—including synthetic lung surfactant—that could help millions more newborns, and their mothers, survive.
Water is made from liquid oxygen and hydrogen in the space shuttle's fuel cells (the fuel cells can make 25 lb (11 kg) of water per hour). The water passes through a hydrogen separator to eliminate any trapped hydrogen gas (excess hydrogen gas is dumped overboard). The water is then ...
Though hydroponics is typically much cheaper over time, it does require a substantial upfront cost to establish any sort of larger system. Next, there's the threat of power failure, which can cause pumps to stop working and ruin crops. Finally, many people fear that hydroponics requires ...
Using air from the atmosphere for supersonic jet engines to power a lightweight spacecraft will ultimately lessen the cost of putting the spacecraft into orbit. Currently, it costs about $10,000 per pound ($22,000/kg) to put an object in orbit. At those prices, it would cost $1,500...
It's also less risky for the SAR teams and doesn't cost as much money. The 10 percent of missions that involve a search cost the Coast Guard more than $50 million each year [source: U.S. Coast Guard]. The mission of any Air/Sea Rescue (ASR) team is simple: get people out of ...
Birmingham, Alabama, tops the list as the most dangerous city in the United States, with an estimated crime cost of $11,392 per capita. Learn More: Most Dangerous Cities in the U.S. by Cost of Crime per Capita 3. What is cream of tartar also known as? Ethylene glycol Hydrogen peroxid...
And here's the twist—Myrcene doesn’t contribute much to flavor directly. What it does is trick your brain. It smells like fruit, and that aroma blends with your malt and alcohol perception to simulate a taste that isn’t chemically there. It's the olfactory version of a sleight-of-han...
The dc motors used in radio control racecars and airplanes don’t work very well since they have far and away too much power. In short, they are overkill. They cost more money, require resistive speed control to slow them down and as a result waste a lot of battery power. Ideally you...
That's enough torque to move the 4,200-pound (1,905-kg) car 100 miles per hour (161 kph) on a level road. Smaller electric motors maneuver the wheels to steer the car, and electrically controlled brake calipers bring the car to a stop. The gaseous hydrogen fuel needed to power this...