Water, aka H2O
oxygen
"Hydro" does not mean water in Greek; it actually means "water" in English. The element you are referring to that turns into water when it burns in air is hydrogen (not hydro), with the chemical symbol H. When hydrogen gas reacts with oxygen in the air, it forms water (H2O) through a chemical reaction.
When hydrogen burns in air, it forms water (H2O). This is a chemical reaction in which hydrogen gas (H2) reacts with oxygen gas (O2) to produce water vapor.
When an element burns in air, it reacts with oxygen to form a compound known as an oxide. The specific oxide formed depends on the element being burned. For example, when carbon burns, it forms carbon dioxide (CO2) and when magnesium burns, it forms magnesium oxide (MgO).
hydrogen burns in air with a pop sound
One chemical property of hydrogen is its ability to react with oxygen to form water. Hydrogen also exhibits the property of being highly flammable when exposed to air or an oxygen-containing atmosphere.
Water.
Steam
When hydrogen burns in air with H2+O2= H20
It burns very easily in air. With the right ratio of air-to-hydrogen, it is explosive.
Magnesium is the element that gives dazzling light when it burns in air. This is due to the intense white light produced as a result of the combustion reaction with oxygen.
The hydrogen within the paraffin of a candle (the wax) severs its bonds with the carbon (the other element in the paraffin) because the energy the heat produces is enough to do so. The hydrogen then bonds with the oxygen atoms around it, and forms H2O. You can test this by covering a lit candle with a clear beaker. You will observe that water condenses around the flame.