 I have some warm water in this beaker and a magnesium ribbon. I'll place this magnesium ribbon inside the water and I want to see what happens. Okay, let's look closely. So, do we see a reaction happening? How can we say? Well, if we look closely on the magnesium ribbon, we can see some bubbles being formed on the ribbon itself, right? And if you look closer, you will also see some bubbles rising up. So, we do see some reaction happening. And what do these bubbles indicate? Well, they show that there is a gas which is forming. Turns out when magnesium reacts with hot or warm water, there is a reaction. There is a chemical reaction which happens. The gas that is released is hydrogen gas and also magnesium hydroxide forms. So, this shows that metals can react with water and some metals react with hot water. Some can even react with normal water like sodium or lithium. And some can react with steam like iron. But there are also some metals which do not react with water at all. That is copper and gold.