hydrogen

«hydrogen» in Mova's school dictionary: The lightest of all chemical elements; a gas with no… — its meaning for a pupil, its sense in the lessons and examples, with 5 sentences of Mova's corpora that use it.

part of speech

noun (hydrogen — uncountable)

meaning for a pupil

The lightest of all chemical elements; a gas with no colour, smell or taste that burns easily. Its chemical symbol is H. tree →

sense in the lessons

In science: hydrogen is number 1 in the periodic table; it is the most common element in the universe; stars like the Sun get energy by turning hydrogen into helium. Water is H2O: two atoms of hydrogen and one of oxygen. Hydrogen is used as a clean fuel for some buses and rockets. Phrases: «hydrogen gas», «hydrogen fuel», «hydrogen and oxygen».

examples

• Water is made of hydrogen and oxygen. tree →
• Hydrogen is the lightest gas there is. tree →
• The Sun is mostly hydrogen. tree →
• Some buses run on hydrogen fuel. tree →
• Hydrogen burns with a squeaky pop in a test tube. tree →
• Hydrogen's symbol is H. tree →
• Old airships were filled with hydrogen, which is dangerous because it burns. tree →

note

Uncountable. Symbol H, atomic number 1. Safety: hydrogen catches fire very easily — party balloons use helium instead, which does not burn. Hydrogen is a gas at room temperature.

In the corpora

• "H2O" means two hydrogen atoms joined to one oxygen atom: that is one molecule of water.
• Salt is made of sodium and chlorine; sugar is made of carbon, hydrogen and oxygen.
• Burning wax joins its carbon and hydrogen with oxygen and makes carbon dioxide and water vapour.
• Antoine Lavoisier showed by careful weighing that matter is not lost when things burn or react; he also named oxygen and hydrogen.
• Jupiter is a gas giant made mostly of hydrogen and helium, like the Sun, and has no solid surface to stand on.

Trees and pragmatics

Every meaning and example of «hydrogen» parsed by Mova, each sentence with its dependency tree and frames.