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Using hydrogen is undoubtedly clean—it is combined with oxygen to produce water vapor and energy and has applications for powering utilities, homes, and cars. But producing it can involve dirtier sources of energy, often natural gas, which contains climate-warming methane. One reason hydrogen has...
The sun is made ofgas and plasma. Most of the gas — 92% — is hydrogen. If the sun were smaller, it would just be a huge ball of hydrogen akin toJupiter. According to NASA Space Place, the hydrogen in the sun's core is held together by a lot ofgravityresulting in high pressure...
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Hot air balloons are based on a very basic scientific principle: warmer air rises in cooler air. Essentially, hot air is lighter than cool air, because it has less mass per unit of volume. A cubic foot of air weighs roughly 28 grams (about an ounce). If you heat that air by 100 de...
As tempting as it is to cite one, no single number can describe the temperature of the whole Sun. Its layers are at different temperatures because they're doing very different things. The Sun is a gigantic dynamo powered by hydrogen fusion within its plasma core. At pressures in the trillio...
Hydrogen-based reduction of iron ores is the key technology for future sustainable ironmaking, to mitigate the CO2 burden from the steel industry, accounting for ~7–8% of all global emissions. However, using hydrogen as a reductant prompts concerns abou
If you want to be technical about it, a fuel cell is an electrochemical energy conversion device. Discovered in the 1800s, a fuel cell converts the chemicals hydrogen and oxygen into water, and in the process it produces electricity.
The decomposed material is released as volatile gases, typically a compound of hydrogen, carbon and oxygen. When the gas is hot enough, the compound molecules break apart, and theatomsrecombine with the oxygen to form water, carbon dioxide and other products. ...