Before revision: The chemical reaction that takes place is: Zr + 2 H2O -> ZrO2 + 2 H2 ( gas ) Hydriding occurs when the product gas (hydrogen) precipitates out as hydrides within the zirconium.
After revision: The chemical reaction that takes place is: Zr + 2 H2O → ZrO2 + 2 H2 ( g ) Hydriding occurs when the product gas (hydrogen) precipitates out as hydrides within the zirconium.