Take some water in a glass test tube. Cover this test tube with a funnel and heat. Close the funnel. Water will get converted into water vapour. Water vapour will again get converted into water on coming in contact with the wall of the funnel. We can see this in the from of drops of water on the internal surface of the funnel. So we can say that conversion of water into vapour is an unstable change. The change can be written in the following way.Similarly can you solidify the formed by melting of ice ?We can say that change of state of substance is an unstable change.Can you solidify the water formed by melting of ice.

Take some water in a glass test tube. Cover this test tube with a funn

1.	Take some water in a glass test tube. Cover this test tube with a funnel and heat. Close the funnel. Water will get converted into water vapour. Water vapour will again get converted into water on coming in contact with the wall of the funnel. We can see this in the from of drops of water on the internal surface of the funnel. So we can say that conversion of water into vapour is an unstable change. The change can be written in the following way.Similarly can you solidify the formed by melting of ice ?We can say that change of state of substance is an unstable change.Can you solidify the water formed by melting of ice.
Answer» Yes, water can be converted to ice again by keeping in freezer of refrigerator.