what is the relation between a solide and a liquid

Well ice can turn into water.
Try reading:
http://en.wikipedia.org/wiki/State_of_matter

http://en.wikipedia.org/wiki/Solids
http://en.wikipedia.org/wiki/Liquids

The relation between a solid and a liquid lies in the different states of matter they represent.

A solid is one of the three fundamental states of matter, along with liquid and gas. Solids have a definite shape and volume, meaning they maintain their shape and do not flow or expand to fill a container. Examples of solids include ice, wood, and metal.

A liquid, on the other hand, is another state of matter that possesses a definite volume but takes the shape of its container. Unlike a solid, a liquid can flow and is not rigid. Examples of liquids include water, oil, and milk.

The relationship between a solid and a liquid becomes apparent when we consider the process of melting. When heat is applied to a solid substance, its temperature increases. At a certain point, called the melting point, the solid starts to change its state and turns into a liquid. This phenomenon is commonly observed when ice melts into water. The process works in reverse as well, with a liquid freezing and transforming into a solid when its temperature decreases to the freezing point.

Understanding the relationship between solids and liquids can be further explored by studying the properties and behaviors of different states of matter. You can find more detailed information on the concept of states of matter, solids, and liquids in the provided Wikipedia links.