Fluids are different than solids in that they have a flexible shape. Pressure applied in a fluid has different, characteristics, compared with pressure applied by a solid. Also, some objects can float in a fluid. This lesson will answer those questions. There is a mini-quiz at the end of the lesson.
Fluids have a flexible shape and somewhat take the shape of their containers.
A gas will often mix with other gases. If a gas is heavier or more dense than other gases, it will sink to the bottom and take the shape of the container. Since the gas is heavier than air, it settled in a valley. There was so much of the gas that it suffocated all the people and animals that lived in that valley. A gas in a closed container will completely take the shape of the container.