RIGID:-
Rigid means 'unbending' or inflexible. A solid is a from of matter so that it maintains its shape when subjected to outside force.
example:- A ball bearing made of hardened steel is a good example of a rigid body.
FLUIDS:-
Fluids are the substances which have tendency to flow. A liquid is a fluid form of matter which occupies the space of the container.
👉Liquids have a well defined surface.
👉 A gas is a fluid from of matter which fills the whole container in which it is kept.
💬 LIQUID AND GASES ARE KNOWN AS FLUIDS.
➢ A liquid is a fluid form of matter which occupies the lower part of the container. Being fluids, liquids require a container to keep them. A liquid has a well-defined surface, so a liquid can be kept in an open container. The liquid will not escape from the open container by itself. Water and milk are two common liquids around us.
➢ A gas is a fluid from of matter which fills the whole container in which it is kept. Being fluids, gases also require a container to keep them. A gas does not have a free surface, so a gas has to be kept in a closed container. A gas will escape if kept in an open container. This is why gases are usually kept in air-tight gas cylinders. For example, cooking gas (LPG) is kept in air-tight metal cylinders. From this discussion we conclude that both, liquids and gases are known as fluids. Characteristic of liquids and gases of ‘flowing’ easily is called ‘fluidity’. Due to fluidity, liquids and gases change their shapes readily when subjected to outside force.Read more on Sarthaks.com - https://www.sarthaks.com/239943/write-the-short-note-on-rigid-and-fluid
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