hydrogen
氢气,氢,氢能,氢水
Definitions
- 1
- : a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. Symbol: H; atomic weight: 1.00797; atomic number: 1; density: 0.0899 grams/liter at 0°C and 760 millimeters pressure.
Examples
That’s because plastics are mainly made up of carbon and hydrogen, very widespread elements.
Making renewable hydrogen requires making electricity to send a charge through water to split the liquid into hydrogen and oxygen.
There, a chemical process breaks the bond between water’s hydrogen and oxygen molecules, forming heat.
To begin, the scientists shined X-ray light on hydrogen gas.
Polyethylene is a long molecule, in which hydrogen atoms are connected to a carbon backbone that can be thousands of carbon atoms long.
Methane (chemical formula CH4) is one of the simplest hydrocarbons, which literally means “containing hydrogen and carbon.”
From that, they extracted the ratio of the number of deuterium atoms to the number of hydrogen atoms.
They found that there are roughly 1,900 hydrogen atoms for each deuterium atom in the water on Comet 67P.
Deuterium is an isotope of hydrogen containing a proton and neutron in its nucleus, while normal hydrogen has only a proton.
Jupiter and its cousins, by contrast, are mostly made of hydrogen and hydrogen compounds.
Hydrogen sulphid is easily prepared in the simple apparatus shown in Fig. 30.
It is allowed to cool, and hydrogen sulphid gas is passed through it for about five minutes.
Ammonia is a compound of nitrogen and hydrogen, but it cannot be formed by the direct union of these gases.
One morning he found that the amount of hydrogen was scarcely perceptible; still there was water in the pit.
The older workman reassured them; the carbon was much heavier than oxygen, and even thicker than hydrogen.