 Good morning. We are going to be studying about matter building. Before starting, if you are able to identify the object, this is, yes, this is football. Inside football, we are pulling out air. So, there are two types of matter. State of matter that we are making here, one is gas. The other one is solid. And what is the difference between the two figures? The first figure, here, the ball has been punctured, but the air has been leaked. The other one, it is cunnifilm. So, we can say that the solid without any gas filled or liquid filled, it is irregular in shape. Whereas, if there is gas or liquid inside this cunnifilm, it will have an irregular shape. So, we have some of the examples with solid and gases together. We can say with the glue, tires of our cycle bikes, many other things. So, one is solid, the other one is gas. Football without air is having an irregular shape. We fill air inside the football, it has a perfect round shape. Next, what if we are filling football with liquid? Have you tried it ever? It will become heavy and it will be able to play football. But, we can have liquid inside football. So, there we can have three states of matter, solid, liquid and gases. The basic difference between solid, liquid and gases are the molecules in solid and tightly packed. So, they are having a proper fixed shape and volume. Whereas, in liquid the molecules are separated apart and the intermolecular forces of attraction is weaker than as compared to solids. Whereas, in gases we are able to see the molecules are very very far apart and the intermolecular forces of attraction is the least among the gases. So, the solids are having definite shape as well as the definite volume, they have a specific boundary. Whereas, in liquids there is no definite shape but they possess volume. Whereas, in gases they don't have any fixed shape and any volume. There are few people who have tried liquid filled water, liquid filled in football. So, this is a game where the football is filled with liquid and they are playing under water. So, there is a question, there is an activity. Why we are filling liquid inside this? And what is the reason behind filling of liquid inside the football in this game?